When a DLP violation occurs, DLP Assist also injects a header into the EML file to indicate the violation. If the user removes the content that is in violation, the header is automatically removed as well.
If the violation remains unchanged, DLP Assist invokes a Microsoft Outlook API which prompts the user with a final warning, giving them another opportunity to revise the message before sending.
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If the user proceeds without making changes, the email will be sent from the client with headers embedded into the EML showing that message contains a DLP violation. Organizations can configure their outbound mail transfer agent (MTA) to take appropriate action based on these headers. For those with Microsoft as their outbound MTA, Cloudflare’s DLP Assist integrates with Microsoft Purview, enabling organizations to block, encrypt, or require approval before sending.
For example, if an organization configures Purview to block the email, users will receive a notification similar to this one.
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Violations detected by the DLP Assist application can also be sent externally through our Logpush feature. Customers have the flexibility to integrate this data with SIEM or SOAR platforms for deeper analysis, or store it in bucket storage solutions like Cloudflare R2. Additionally, customers can enhance their reporting capabilities by viewing block data directly within their outbound gateway.
As we continue to improve our DLP engine, we're introducing more advanced ways to analyze messages. During Security Week 2025, we’re unveiling new AI methodologies that automatically fine-tune DLP confidence levels using machine learning models. Initially, these enhancements will be rolled out for Gateway violations, but we plan to extend them to email scanning in the near future. For more details, see the associated blog post.
Cloudflare One’s DLP Assist is designed for quick deployment, enabling organizations to implement a data loss prevention solution with minimal effort. It allows customers to immediately begin scanning emails for sensitive data and take action to prevent unauthorized sharing, ensuring compliance and security from day one.
To get started, navigate to the Zero Trust dashboard and click on the Email Security tab. From there, select the Outbound DLP tab.
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To install DLP Assist, organizations can download the manifest file, which provides Microsoft with the necessary instructions to install the application within Outlook. Administrators can then upload this manifest file by going to Integrated Apps within the Microsoft 365 Admin Center and selecting Upload Custom Apps:
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This application is best suited for use with OWA (Outlook Web Access) and the desktop (Mac and Windows) Outlook client. Due to Microsoft limitations, a stable experience on mobile devices is not yet available.
We’re continuously expanding our solutions to help organizations protect their data. Exciting new DLP and Email Security features are on the way throughout 2025, so stay tuned for upcoming announcements.
To learn more about our DLP and Email Security solutions, reach out to your Cloudflare representative. Want to see our detections in action? Run a free Retro Scan to uncover any potentially malicious messages hiding in your inbox.
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Forrester Research has recognized Cloudflare as a Leader in its The Forrester Wave™: Web Application Firewall Solutions, Q1 2025 report. This market analysis helps security and risk professionals select the right solution for their needs. According to Forrester:
“Cloudflare is a strong option for customers that want to manage an easy-to-use, unified web application protection platform that will continue to innovate.”
In this evaluation, Forrester assessed 10 Web Application Firewall (WAF) vendors across 22 criteria, including product security and vision. We believe this recognition is due to our continued investment in our product offering. Get a complimentary copy of the report here.
Since introducing our first WAF in 2013, Cloudflare has transformed it into a robust, enterprise-grade Application Security platform. Our fully integrated suite includes WAF, bot mitigation, API security, client-side protection, and DDoS mitigation, all built on our expansive global network. By leveraging AI and machine learning, we deliver industry-leading security while enhancing application performance through our content delivery and optimization solutions.
According to the Forrester report, “Cloudflare stands out with features that help customers work more efficiently.” Unlike other solutions in the market, Cloudflare’s WAF, API Security, bot detection, client-side security, and DDoS protection are natively integrated within a single platform, running on a unified engine. Our integrated solution empowers a seamless user experience and enables advanced threat detection across multiple vectors to meet the most demanding security requirements.
Forrester’s evaluation of Web Application Firewall solutions is one of the most comprehensive assessments in the industry. We believe this report highlights Cloudflare’s integrated global cloud platform and our ability to deliver enterprise-grade security without added complexity. We don’t just offer a WAF — we provide a flexible, customizable security toolkit designed to address your unique application security challenges.
Cloudflare continuously leads the WAF market through our strategic vision and the breadth of our capabilities. We center our approach on relentless innovation, delivering industry-leading security features, and ensuring a seamless management experience with enterprise processes and tools such as Infrastructure as Code (IaC) and DevOps. Our predictable cadence of major feature releases, powered by annual initiatives like Security Week and Birthday Week, ensures that customers always have access to the latest security advancements.
We believe Forrester also highlighted Cloudflare’s extensive security capabilities, with particular recognition of the significant improvements in our API security offerings.
In the report, Cloudflare received the highest possible scores in 15 out of 22 criteria, reinforcing, in our opinion, our commitment to delivering the most advanced, flexible and easy-to-use web application protection in the industry. Some of the key criteria include:
Detection models: Advanced AI and machine learning models that continuously evolve to detect new threats.
Layer 7 DDoS protection: Industry-leading mitigation of sophisticated application-layer attacks.
Rule creation and modification: Simple, easy to use rule creation experience, propagating within seconds globally.
Management UI: An intuitive and efficient user interface that simplifies security management.
Product security: A robust architecture that ensures enterprise-grade security.
Infrastructure-as-code support: Seamless integration with DevOps workflows for automated security policy enforcement.
Innovation: A forward-thinking approach to security, consistently pushing the boundaries of what’s possible.
First, Cloudflare’s WAF goes beyond traditional rule-based protections, offering a comprehensive suite of detection mechanisms to identify attacks and vulnerabilities across web and API traffic while also safeguarding client environments. We leverage AI and machine learning to detect threats such as attacks, automated traffic, anomalies, and compromised JavaScript, among others. Our industry-leading application-layer DDoS protection makes volumetric attacks a thing of the past.
Second, Cloudflare has also made significant strides in API security. Our WAF can be supercharged with features such as: API discovery, schema validation & sequence mitigation, volumetric detection, and JWT authentication.
Third, Cloudflare simplifies security management with an intuitive dashboard that is easy to use while still offering powerful configurations for advanced practitioners. All features are Terraform-supported, allowing teams to manage the entire Cloudflare platform as code. With Security Analytics, customers gain a comprehensive view of all traffic, whether mitigated or not, and can run what-if scenarios to test new rules before deployment. This analytic capability ensures that businesses can dynamically adapt their security posture while maintaining high performance. To make security management even more seamless, our AI agent, powered by Natural Language Processing (NLP), helps users craft and refine custom rules and create powerful visualizations within our analytics engine.
We are confident that Forrester’s report validates what our customers already know: Cloudflare is a leading WAF vendor, offering unmatched security, innovation, and ease of use. As threats continue to evolve, we remain committed to pushing the boundaries of web security to protect organizations worldwide.
If you’re looking for a powerful, scalable, and easy-to-manage web application firewall, Cloudflare is the best choice for securing your applications, APIs, and infrastructure.
Learn more about Cloudflare WAF by creating an account today and see why Forrester has recognized us as a leader in the market.
Forrester does not endorse any company, product, brand, or service included in its research publications and does not advise any person to select the products or services of any company or brand based on the ratings included in such publications. Information is based on the best available resources. Opinions reflect judgment at the time and are subject to change. For more information, read about Forrester’s objectivity here .
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In today’s fast-paced digital landscape, companies are managing an increasingly complex mix of environments — from SaaS applications and public cloud platforms to on-prem data centers and hybrid setups. This diverse infrastructure offers flexibility and scalability, but also opens up new attack surfaces.
To support both business continuity and security needs, “security must evolve from being reactive to predictive”. Maintaining a healthy security posture entails monitoring and strengthening your security defenses to identify risks, ensure compliance, and protect against evolving threats. With our newest capabilities, you can now use Cloudflare to achieve a healthy posture across your SaaS and web applications. This addresses any security team’s ultimate (daily) question: How well are our assets and documents protected?
A predictive security posture relies on the following key components:
Real-time discovery and inventory of all your assets and documents
Continuous asset-aware threat detection and risk assessment
Prioritised remediation suggestions to increase your protection
Today, we are sharing how we have built these key components across SaaS and web applications, and how you can use them to manage your business’s security posture.
Regardless of the applications you have connected to Cloudflare’s global network, Cloudflare actively scans for risks and misconfigurations associated with each one of them on a regular cadence. Identified risks and misconfigurations are surfaced in the dashboard under Security Center as insights.
Insights are grouped by their severity, type of risks, and corresponding Cloudflare solution, providing various angles for you to zoom in to what you want to focus on. When applicable, a one-click resolution is provided for selected insight types, such as setting minimum TLS version to 1.2 which is recommended by PCI DSS. This simplicity is highly appreciated by customers that are managing a growing set of assets being deployed across the organization.
To help shorten the time to resolution even further, we have recently added role-based access control (RBAC) to Security Insights in the Cloudflare dashboard. Now for individual security practitioners, they have access to a distilled view of the insights that are relevant for their role. A user with an administrator role (a CSO, for example) has access to, and visibility into, all insights.
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In addition to account-wide Security Insights, we also provide posture overviews that are closer to the corresponding security configurations of your SaaS and web applications. Let’s dive into each of them.
Without centralized posture management, SaaS applications can feel like the security wild west. They contain a wealth of sensitive information – files, databases, workspaces, designs, invoices, or anything your company needs to operate, but control is limited to the vendor’s settings, leaving you with less visibility and fewer customization options. Moreover, team members are constantly creating, updating, and deleting content that can cause configuration drift and data exposure, such as sharing files publicly, adding PII to non-compliant databases, or giving access to third party integrations. With Cloudflare, you have visibility across your SaaS application fleet in one dashboard.
Posture findings across your SaaS fleet
From the account-wide Security Insights, you can review insights for potential SaaS security issues:
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You can choose to dig further with Cloud Access Security Broker (CASB) for a thorough review of the misconfigurations, risks, and failures to meet best practices across your SaaS fleet. You can identify a wealth of security information including, but not limited to:
Publicly available or externally shared files
Third-party applications with read or edit access
Unknown or anonymous user access
Databases with exposed credentials
Users without two-factor authentication
Inactive user accounts
You can also explore the Posture Findings page, which provides easy searching and navigation across documents that are stored within the SaaS applications.
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Additionally, you can create policies to prevent configuration drift in your environment. Prevention-based policies help maintain a secure configuration and compliance standards, while reducing alert fatigue for Security Operations teams, and these policies can prevent the inappropriate movement or exfiltration of sensitive data. Unifying controls and visibility across environments makes it easier to lock down regulated data classes, maintain detailed audit trails via logs, and improve your security posture to reduce the risk of breaches.
How it works: new, real-time SaaS documents discovery
Delivering SaaS security posture information to our customers requires collecting vast amounts of data from a wide range of platforms. In order to ensure that all the documents living in your SaaS apps (files, designs, etc.) are secure, we need to collect information about their configuration — are they publicly shared, do third-party apps have access, is multi-factor authentication (MFA) enabled?
We previously did this with crawlers, which would pull data from the SaaS APIs. However, we were plagued with rate limits from the SaaS vendors when working with larger datasets. This forced us to work in batches and ramp scanning up and down as the vendors permitted. This led to stale findings and would make remediation cumbersome and unclear – for example, Cloudflare would be reporting that a file is still shared publicly for a short period after the permissions were removed, leading to customer confusion.
To fix this, we upgraded our data collection pipeline to be dynamic and real-time, reacting to changes in your environment as they occur, whether it’s a new security finding, an updated asset, or a critical alert from a vendor. We started with our Microsoft asset discovery and posture findings, providing you real-time insight into your Microsoft Admin Center, OneDrive, Outlook, and SharePoint configurations. We will be rapidly expanding support to additional SaaS vendors going forward.
Listening for update events from Cloudflare Workers
Cloudflare Workers serve as the entry point for vendor webhooks, handling asset change notifications from external services. The workflow unfolds as follows:
Webhook listener: An initial Worker acts as the webhook listener, receiving asset change messages from vendors.
Data storage & queuing: Upon receiving a message, the Worker uploads the raw payload of the change notification to Cloudflare R2 for persistence, and publishes it to a Cloudflare Queue dedicated to raw asset changes.
Transformation Worker: A second Worker, bound as a consumer to the raw asset change queue, processes the incoming messages. This Worker transforms the raw vendor-specific data into a generic format suitable for CASB. The transformed data is then:
Stored in Cloudflare R2 for future reference.
Published on another Cloudflare Queue, designated for transformed messages.
CASB Processing: Consumers & Crawlers
Once the transformed messages reach the CASB layer, they undergo further processing:
Polling consumer: CASB has a consumer that polls the transformed message queue. Upon receiving a message, it determines the relevant handler required for processing.
Crawler execution: The handler then maps the message to an appropriate crawler, which interacts with the vendor API to fetch the most up-to-date asset details.
Data storage: The retrieved asset data is stored in the CASB database, ensuring it is accessible for security and compliance checks.
With this improvement, we are now processing 10 to 20 Microsoft updates per second, or 864,000 to 1.72 million updates daily, giving customers incredibly fast visibility into their environment. Look out for expansion to other SaaS vendors in the coming months.
A unique challenge of securing web applications is that no one size fits all. An asset-aware posture management bridges the gap between a universal security solution and unique business needs, offering tailored recommendations for security teams to protect what matters.
Posture overview from attacks to threats and risks
Starting today, all Cloudflare customers have access to Security Overview, a new landing page customized for each of your onboarded domains. This page aggregates and prioritizes security suggestions across all your web applications:
Any (ongoing) attacks detected that require immediate attention
Disposition (mitigated, served by Cloudflare, served by origin) of all proxied traffic over the last 7 days
Summary of currently active security modules that are detecting threats
Suggestions of how to improve your security posture with a step-by-step guide
And a glimpse of your most active and lately updated security rules
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These tailored security suggestions are surfaced based on your traffic profile and business needs, which is made possible by discovering your proxied web assets.
Discovery of web assets
Many web applications, regardless of their industry or use case, require similar functionality: user identification, accepting payment information, etc. By discovering the assets serving this functionality, we can build and run targeted threat detection to protect them in depth.
As an example, bot traffic towards marketing pages versus login pages have different business impacts. Content scraping may be happening targeting your marketing materials, which you may or may not want to allow, while credential stuffing on your login page deserves immediate attention.
Web assets are described by a list of endpoints; and labelling each of them defines their business goals. A simple example can be POST requests to path /portal/login, which likely describes an API for user authentication. While the GET requests to path /portal/login denote the actual login webpage.
To describe business goals of endpoints, labels come into play. POST requests to the /portal/login endpoint serving end users and to the /api/admin/login endpoint used by employees can both can be labelled using the same cf-log-inmanaged label, letting Cloudflare know that usernames and passwords would be expected to be sent to these endpoints.
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API Shield customers can already make use of endpoint labelling. In early Q2 2025, we are adding label discovery and suggestion capabilities, starting with three labels, cf-log-in, cf-sign-up, and cf-rss-feed. All other customers can manually add these labels to the saved endpoints. One example, explained below, is preventing disposable emails from being used during sign-ups.
Always-on threat detection and risk assessment
Use-case driven threat detection
Customers told us that, with the growing excitement around generative AI, they need support to secure this new technology while not hindering innovation. Being able to discover LLM-powered services allows fine-tuning security controls that are relevant for this particular technology, such as inspecting prompts, limit prompting rates based on token usage, etc. In a separate Security Week blog post, we will share how we build Cloudflare Firewall for AI, and how you can easily protect your generative AI workloads.
Account fraud detection, which encompasses multiple attack vectors, is another key area that we are focusing on in 2025.
On many login and signup pages, a CAPTCHA solution is commonly used to only allow human beings through, assuming only bots perform undesirable actions. Put aside that most visual CAPTCHA puzzles can be easily solved by AI nowadays, such an approach cannot effectively solve the root cause of most account fraud vectors. For example, human beings using disposable emails to sign up single-use accounts to take advantage of signup promotions.
To solve this fraudulent sign up issue, a security rule currently under development could be deployed as below to block all attempts that use disposable emails as a user identifier, regardless of whether the requester was automated or not. All existing or future cf-log-in and cf-sign-up labelled endpoints are protected by this single rule, as they both require user identification.
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Our fast expanding use-case driven threat detections are all running by default, from the first moment you onboarded your traffic to Cloudflare. The instant available detection results can be reviewed through security analytics, helping you make swift informed decisions.
API endpoint risk assessment
APIs have their own set of risks and vulnerabilities, and today Cloudflare is delivering seven new risk scans through API Posture Management. This new capability of API Shield helps reduce risk by identifying security issues and fixing them early, before APIs are attacked. Because APIs are typically made up of many different backend services, security teams need to pinpoint which backend service is vulnerable so that development teams may remediate the identified issues.
Our new API posture management risk scans do exactly that: users can quickly identify which API endpoints are at risk to a number of vulnerabilities, including sensitive data exposure, authentication status, Broken Object Level Authorization (BOLA) attacks, and more.
Authentication Posture is one risk scan you’ll see in the new system. We focused on it to start with because sensitive data is at risk when API authentication is assumed to be enforced but is actually broken. Authentication Posture helps customers identify authentication misconfigurations for APIs and alerts of their presence. This is achieved by scanning for successful requests against the API and noting their authentication status. API Shield scans traffic daily and labels API endpoints that have missing and mixed authentication for further review.
For customers that have configured session IDs in API Shield, you can find the new risk scan labels and authentication details per endpoint in API Shield. Security teams can take this detail to their development teams to fix the broken authentication.
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We’re launching today with scans for authentication posture, sensitive data, underprotected APIs, BOLA attacks, and anomaly scanning for API performance across errors, latency, and response size.
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Simplify maintaining a good security posture with Cloudflare
Achieving a good security posture in a fast-moving environment requires innovative solutions that can transform complexity into simplicity. Bringing together the ability to continuously assess threats and risks across both public and private IT environments through a single platform is our first step in supporting our customers’ efforts to maintain a healthy security posture.
To further enhance the relevance of security insights and suggestions provided and help you better prioritize your actions, we are looking into integrating Cloudflare’s global view of threat landscapes. With this, you gain additional perspectives, such as what the biggest threats to your industry are, and what attackers are targeting at the current moment. Stay tuned for more updates later this year.
If you haven’t done so yet, onboard your SaaS and web applications to Cloudflare today to gain instant insights into how to improve your business’s security posture.
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Today, we are excited to announce that Forrester has recognized Cloudflare Email Security as a Strong Performer and among the top three providers in the ‘current offering’ category in “The Forrester Wave™: Email, Messaging, And Collaboration Security Solutions, Q2 2025” report. Get a complimentary copy of the report here.
According to Forrester:
“Cloudflare is a solid choice for organizations looking to augment current email, messaging, and collaboration security tooling with deep content analysis and processing and malware detection capabilities.”
Cloudflare’s top-ranked criteria
In this evaluation, Forrester analyzed 10 Email Security vendors across 27 different criteria. Cloudflare received the highest scores possible in nine key evaluation criteria, and also scored among the top three in the current offering category. We believe this recognition is due to our ability to deliver stronger security outcomes across email and collaboration tools. These highlights showcase the strength and maturity of our Email Security solution:
Antimalware & sandboxing
Cloudflare’s advanced sandboxing engine analyzes files, whether directly attached or linked via cloud storage, using both static and dynamic analysis. Our AI-powered detectors evaluate attachment structure and behavior in real time, enabling protection not only against known malware but also emerging threats.
Malicious URL detection & web security
URLs are analyzed at delivery and again at click-time using Cloudflare’s global network. Our OCR and machine learning models extract and analyze metadata and page behavior to determine the maliciousness of a URL. Customers can also isolate suspicious links in remote browser sessions preventing user compromise. We continuously monitor URLs and retroactively remediate messages if the risk changes.
Threat intelligence
With over 4.4 trillion signals ingested daily across DNS, HTTP, and email layers, Cloudflare operates one of the most comprehensive real-time threat intelligence ecosystems. Campaigns observed via our DNS or HTTP layers are used to preemptively block related email threats well before traditional feeds.
Content analysis & processing
Cloudflare uses an ensemble of large language models (LLMs), natural language processing (NLP) techniques, and machine learning (ML) classifiers to analyze message tone, thread behavior, QR codes, and invoice language. These models detect indicators of fraud, business email compromise (BEC), and social engineering that legacy engines often miss.
Reporting & dashboards
Cloudflare’s unified Zero Trust dashboard gives SOC teams full visibility across email, web, cloud, data events. Analysts can pivot across user activity in just a few clicks and export data when needed.
User quarantine
Our quarantine workflow is designed to minimize disruption. Customers can choose several ways to get notifications to users about messages that have been quarantined.
Email authentication
Cloudflare enforces SPF, DKIM, and DMARC alignment automatically. We also offer a free DMARC reporting tool that gives customers visibility into email authentication failures and helps them take control of email brand protection.
Product security
Security is core to Cloudflare’s DNA. All services undergo continuous penetration testing, adhere to SOC 2 Type II and ISO 27001 standards, and operate on Cloudflare’s own infrastructure.
Partner ecosystem
Cloudflare integrates natively with Splunk, Microsoft Sentinel, Palo Alto XSOAR, and ServiceNow, making it easy to bring Cloudflare Email Security into existing SOC workflows. We also partner with leading human risk and awareness platforms to give organizations a more user-centric view of risk and behavior.
These strengths reflect Cloudflare’s commitment to building a comprehensive email security platform, one that’s designed to protect email inboxes and workspaces.
Our email vision
We agree with Forrester’s perspective on where the email security market is headed. Across our customer base, from Fortune 100 enterprises to fast-growing startups, we’ve seen a clear evolution:
Phishing is no longer confined to the inbox.
Attackers are increasingly luring users into external apps, unaudited chat platforms, or legitimate third-party services, bypassing traditional security controls. This shift is forcing SOC teams to think beyond just email and adopt a more holistic approach to workspace security.
Cloudflare was one of the first vendors to position email security as part of a broader SASE and Zero Trust strategy, securing not just messages, but the entire user surface. Looking ahead, we’re doubling down on this integrated vision of workspace security to give SOC teams simpler investigations and faster response.
What’s next: our strategic focus
We will continue to:
Build AI-driven automation
Reduce alert fatigue and manual triage by using LLMs to summarize incidents, auto-label threats, and recommend next steps, allowing junior analysts to act with senior-level confidence.
Deepen integrations across the Cloudflare ecosystem
Continue to unify signals across email, web, cloud, and data to give security teams a single view of user behavior driving faster remediations.
Enhance real-time user coaching
Deliver contextual guidance at the moment of risk, whether via banners, isolation flows, or in-app warnings, to help users make safer and more informed decisions.
Develop best-in-class detections
Continue investing in advanced models detecting new and novel phishing campaigns by leveraging global telemetry from our network edge to stop novel threats faster.
Cloudflare has always approached email security not as a standalone point solution, but as a core pillar of unified threat protection, deeply integrated across the modern enterprise security stack.
Ready to enhance your email security?
We provide all organizations (whether a Cloudflare customer or not) with free access to our Retro Scan tool, allowing them to use our predictive AI models to scan existing inbox messages. Retro Scan will detect and highlight any threats found, enabling organizations to remediate them directly in their email accounts. With these insights, organizations can implement further controls, either using Cloudflare Email Security or their preferred solution, to prevent similar threats from reaching their inboxes in the future.
If you are interested in how Cloudflare can help secure your inboxes, sign up for a phishing risk assessment here.
Forrester does not endorse any company, product, brand, or service included in its research publications and does not advise any person to select the products or services of any company or brand based on the ratings included in such publications. Information is based on the best available resources. Opinions reflect judgment at the time and are subject to change. For more information, read about Forrester’s objectivity here.
Security Week 2025 has officially come to a close. Our updates for the week included a deep dive on our AI offering, a unified navigation experience, and an introduction to our AI Agent Cloudy....
Cloudflare introduces a single platform for unified security posture management, helping protect SaaS and web applications deployed across various environments. ...