CVE-2026-11200 in Chrome
Summary
by MITRE • 06/05/2026
Inappropriate implementation in WebRTC in Google Chrome prior to 149.0.7827.53 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 06/05/2026
This vulnerability represents a critical cross-origin data leakage issue within the WebRTC implementation of Google Chrome versions prior to 149.0.7827.53. The flaw stems from inadequate validation and sanitization of WebRTC signaling messages and media streams that occur during peer-to-peer connections. Attackers could craft malicious HTML pages that exploit improper handling of cross-origin resources, allowing them to access sensitive data from different origins that should normally be isolated by browser security policies. The vulnerability specifically targets the WebRTC API's handling of peer connections, where the browser fails to properly enforce same-origin policies during the negotiation and data transmission phases of WebRTC sessions. This issue falls under CWE-200, which addresses improper information exposure, and aligns with ATT&CK technique T1071.004 for application layer protocol communication. The technical implementation flaw occurs when the browser processes WebRTC offers and answers from untrusted sources without sufficient cross-origin boundary checking, potentially allowing attackers to intercept or manipulate media streams and signaling data between legitimate peers and malicious actors.
The operational impact of this vulnerability extends beyond simple data leakage to encompass potential privacy violations and information disclosure attacks. An attacker could leverage this flaw to access audio and video streams from other origins, potentially capturing sensitive communications or personal data during WebRTC sessions. The medium severity classification reflects the fact that while the vulnerability requires user interaction through a crafted webpage, it can be exploited in real-world scenarios where users might inadvertently visit malicious sites. The exploitation typically involves creating a malicious WebRTC session that tricks the browser into sharing resources across origin boundaries, potentially leading to unauthorized access to camera, microphone, or other media devices. This vulnerability is particularly concerning in environments where WebRTC is used for video conferencing, real-time communication, or collaborative applications, as it could enable eavesdropping or data interception without user awareness.
Mitigation strategies for this vulnerability should focus on immediate browser updates to version 149.0.7827.53 or later, which contain the necessary patches to properly enforce cross-origin restrictions in WebRTC implementations. Organizations should also implement network-level controls to monitor and restrict WebRTC traffic where possible, though this approach has limitations due to the protocol's peer-to-peer nature. Browser security configurations should be reviewed to ensure proper sandboxing and isolation of WebRTC components, while users should be educated about the risks of visiting untrusted websites that may contain malicious WebRTC implementations. Additional defensive measures include implementing Content Security Policy directives that restrict WebRTC usage and monitoring for unusual WebRTC connection patterns that might indicate exploitation attempts. Security teams should also consider deploying WebRTC-specific network monitoring tools to detect potential exploitation attempts and maintain updated threat intelligence on related attack vectors targeting WebRTC implementations across different browser vendors.