CVE-2026-95317 in Chrome
Summary
by MITRE • 09/29/2026
Incorrect authorization in MediaCapture in Google Chrome prior to 154.0.8037.57 allowed a remote attacker leveraging social engineering to obtain cross-origin data via a crafted Chrome extension. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified as an incorrect authorization flaw within the MediaCapture subsystem of Google Chrome prior to version 154.0.8037.57 represents a significant breach in browser-based access control mechanisms. This issue stems from a logic error where the application fails to properly enforce origin checks when handling media capture permissions, specifically regarding audio and video streams. In standard web security models, cross-origin data isolation is paramount to prevent malicious sites or extensions from accessing resources belonging to other domains. However, due to this authorization lapse, the browser incorrectly granted access privileges that should have been restricted based on the requesting entity's origin context. This misconfiguration allows a remote attacker who has successfully leveraged social engineering techniques to trick a user into installing a crafted Chrome extension to bypass these isolation boundaries. The severity of this flaw is classified as medium by Chromium security standards, indicating that while it requires specific conditions such as user interaction and malicious software installation, the potential for data exfiltration remains substantial.
From a technical perspective, the core issue lies in how MediaCapture APIs interact with permission policies during extension execution. When an extension requests access to media devices or captures streams from web pages, Chrome is designed to verify that the requesting origin matches the context of the page being captured or the permissions granted by the user. In this vulnerable version, the validation logic was insufficient, allowing a maliciously constructed extension to request and receive cross-origin data without proper authorization checks. This effectively neutralizes the Same-Origin Policy protections intended to keep web content isolated from one another. By exploiting this flaw, an attacker can extract sensitive information such as video feeds or audio recordings that originate from different domains than where the extension was invoked. The reliance on social engineering highlights that while the technical vulnerability is in the code, the successful exploitation depends heavily on user behavior and trust in third-party software sources.
The operational impact of this vulnerability extends beyond simple data leakage to include potential privacy violations and credential theft if sensitive information is displayed within captured media streams. An attacker could use a crafted extension to silently record video or audio from tabs belonging to banking sites, email clients, or internal corporate portals, provided the user has granted necessary permissions under deceptive pretenses. This aligns with common attack patterns found in industry frameworks such as CWE-269, which addresses Improper Privilege Management, and specifically relates to issues where an actor is able to obtain elevated privileges or access resources outside their intended scope. Furthermore, this behavior mirrors tactics described in the MITRE ATT&CK framework under techniques related to Collection via Screen Capture or Audio Capture, particularly when executed through browser extensions that masquerade as legitimate tools. The ability to bypass cross-origin restrictions means that even if a user believes they are interacting with a trusted site, their media output can be intercepted and transmitted to an external server controlled by the attacker.
Mitigation strategies for this vulnerability primarily involve immediate software updates. Users must upgrade Google Chrome to version 154.0.8037.57 or later, where these authorization checks have been corrected to ensure strict adherence to origin-based access controls. In addition to patching, organizations and individual users should adopt a principle of least privilege regarding browser extensions. This includes regularly auditing installed extensions, removing those that are no longer needed, and being cautious when granting permissions for media capture or cross-origin data access. Security awareness training is also critical to reduce the success rate of social engineering attacks that lead to the installation of malicious software. By combining timely patch management with vigilant extension hygiene and user education, the risk associated with this type of authorization bypass can be significantly reduced, ensuring that browser-based isolation mechanisms remain effective against sophisticated threats.