CVE-2026-7979 in Chrome
Summary
by MITRE • 05/06/2026
Inappropriate implementation in Media in Google Chrome prior to 148.0.7778.96 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Medium)
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 05/18/2026
This vulnerability represents a cross-origin data leakage issue within Google Chrome's media handling subsystem affecting versions prior to 148.0.7778.96. The flaw stems from inadequate implementation controls that fail to properly enforce cross-origin restrictions when processing media content, creating a pathway for malicious actors to access sensitive data from different origins. The vulnerability falls under the category of insufficient enforcement of security boundaries as classified by CWE-693, specifically manifesting as a violation of the same-origin policy that forms the cornerstone of web security architecture.
The technical implementation flaw occurs when Chrome processes crafted HTML pages containing malicious media elements that exploit improper validation of cross-origin requests. Attackers can construct malicious web pages that leverage media APIs to indirectly access data from other origins, bypassing the standard security mechanisms designed to prevent such cross-origin information disclosure. This type of vulnerability typically involves the manipulation of media elements such as video or audio streams, where the browser's media processing logic fails to properly validate or sanitize cross-origin access requests, allowing unauthorized data retrieval through indirect means.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables remote attackers to potentially gather sensitive user data, session information, or confidential content from other websites. The medium severity classification indicates that while the vulnerability does not directly enable arbitrary code execution or complete system compromise, it represents a significant threat to user privacy and data confidentiality. Attackers can leverage this flaw to perform reconnaissance activities, gather intelligence about user behavior, or extract sensitive information that could be used for further attacks. The vulnerability particularly affects users who visit malicious websites that exploit this media handling flaw to access cross-origin data without proper authorization.
Mitigation strategies for this vulnerability include immediate deployment of Chrome updates to version 148.0.7778.96 or later, which contain the necessary security patches to address the cross-origin data leakage issue. Organizations should implement comprehensive browser update policies and ensure all users maintain current versions of Chrome to protect against known vulnerabilities. Additionally, administrators should monitor for exploitation attempts through web application firewalls and intrusion detection systems that can identify suspicious media-related requests or cross-origin access patterns. The remediation aligns with ATT&CK technique T1566.001 for credential harvesting and T1071.004 for application layer protocol usage, as attackers may leverage such vulnerabilities to extract sensitive information from web applications. Organizations should also consider implementing content security policies that restrict cross-origin media access and regularly audit their web applications for proper implementation of cross-origin resource sharing controls.