CVE-2026-106355 in Chrome
Summary
by MITRE • 10/07/2026
Missing authorization in Media in Google Chrome on on Windows prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to obtain sensitive information via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as missing authorization in Google Chrome's media subsystem represents a critical failure in access control mechanisms within the browser architecture on Windows platforms prior to version 155.0.8059.39. This flaw specifically affects the handling of multimedia resources and allows for unauthorized data exfiltration under specific conditions involving process isolation boundaries. The core issue lies in the insufficient validation of permissions when media-related APIs interact with underlying system components or internal browser states, creating a pathway that bypasses intended security restrictions designed to keep renderer processes sandboxed from sensitive user data and system resources.
From a technical perspective, modern browsers like Chrome employ a multi-process architecture where each tab runs in an isolated renderer process to limit the blast radius of potential exploits. However, this vulnerability indicates a lapse in enforcing these isolation boundaries when media functionality is invoked via crafted HTML content. An attacker who has already achieved code execution within a compromised renderer process can leverage this missing authorization check to access sensitive information that should remain inaccessible from that context. This typically involves accessing memory segments, file system paths, or internal browser states related to media playback history, cached files, or potentially authenticated session tokens associated with multimedia streams without proper privilege escalation checks.
The operational impact of this vulnerability is significant for users who visit maliciously crafted web pages while using an affected version of Chrome on Windows. Although the initial requirement involves a compromised renderer process, which often implies prior exploitation such as through cross-site scripting or other injection attacks, the ability to escalate privileges from that sandboxed environment allows attackers to harvest sensitive data more effectively than previously possible. This could include personal identification information, financial details stored in browser caches related to media-heavy sites, or credentials used for streaming services. The severity is classified as low by Chromium standards because it relies on a pre-existing compromise of the renderer process rather than being an initial entry point vulnerability, but its existence facilitates further lateral movement and data theft within the user's session.
This flaw aligns with CWE-269, which describes Improper Privilege Assignment, specifically where a subject is granted more privileges than necessary for its intended function. In the context of browser security models, it also relates to violations of the principle of least privilege enforced by sandboxing mechanisms. Furthermore, from an offensive cybersecurity framework perspective such as MITRE ATT&CK, this vulnerability supports techniques associated with Defense Evasion and Credential Access, particularly those involving process injection or abuse of legitimate system features for unauthorized data collection. Attackers can use this pathway to maintain persistence or expand their foothold within the victim's environment by extracting valuable intelligence that was previously protected by browser sandboxing boundaries.
Mitigation strategies primarily involve immediate software updates to ensure all Windows-based Chrome installations are upgraded to version 155.0.8059.39 or later, where these authorization checks have been reinforced and validated. For organizations managing large fleets of devices, automated patch management systems should be configured to prioritize this update due to its potential for facilitating data exfiltration in conjunction with other web-based exploits. Additionally, security teams should monitor browser telemetry for unusual patterns of media API usage that deviate from normal user behavior, as such activity might indicate an attempt to exploit this specific authorization bypass. Implementing strict content security policies and restricting the execution of untrusted scripts can also reduce the likelihood of reaching the initial renderer compromise stage, thereby mitigating the risk associated with this post-exploitation capability.