CVE-2026-79177 in Chrome
Summary
by MITRE • 08/26/2026
Incorrect authorization in Media in Google Chrome on on Windows prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 08/26/2026
The vulnerability identified as an incorrect authorization flaw within Google Chrome on Windows, specifically in versions prior to 152.0.7977.65, represents a significant breach of the browser's sandboxing architecture. This issue stems from a failure in enforcing access controls when handling media-related operations, allowing a remote attacker who has already compromised the renderer process to escalate privileges and bypass system-level security restrictions. The Chromium project classified this vulnerability with a low severity rating, yet its implications for endpoint security remain substantial due to the potential for lateral movement within a compromised environment.
At the technical level, Google Chrome employs a multi-process architecture where each tab or site runs in an isolated renderer process. This sandboxing is designed to prevent malicious code executed on untrusted websites from accessing sensitive system resources, such as the file system, network interfaces, or hardware devices. The flaw arises when media handling components fail to properly validate authorization tokens or permissions before granting access to underlying operating system APIs. By crafting a specific HTML page that triggers these vulnerable media pathways, an attacker can exploit this misconfiguration to execute actions outside the intended sandbox boundary. This effectively neutralizes one of the primary defenses against web-based attacks, allowing code running in a low-privilege context to interact with higher-privileged system resources.
The operational impact of this vulnerability is particularly concerning for organizations relying on Chrome as their primary browsing tool. An attacker who has successfully delivered malicious content via phishing or drive-by downloads can leverage this flaw to move beyond the browser sandbox. This capability enables further reconnaissance, data exfiltration from accessible directories, or even the installation of additional malware payloads that require higher system privileges than those granted by default in a renderer process. While the severity is rated as low because it requires prior compromise of the renderer, it serves as a critical stepping stone for attackers aiming to achieve full system control. It undermines the principle of least privilege inherent in modern browser security models and increases the attack surface available to threat actors targeting Windows endpoints.
To mitigate this risk, organizations must ensure that all instances of Google Chrome are updated to version 152.0.7977.65 or later immediately upon availability. Automated patch management systems should be configured to prioritize these updates across all user workstations and servers where the browser is installed. Additionally, security teams should review endpoint detection and response (EDR) configurations to monitor for unusual process creation events originating from Chrome renderer processes that attempt to access restricted system APIs or execute binaries outside of expected directories. Implementing strict application whitelisting policies can also help restrict unauthorized execution paths even if a sandbox escape occurs.
From an industry standards perspective, this vulnerability aligns with CWE-269, which describes Improper Privilege Management, specifically the failure to enforce proper authorization checks before granting access to system resources. It also relates to CWE-749, where exposed security-critical functionality is not properly protected against unauthorized use. In terms of threat modeling and adversary behavior, this exploit technique corresponds to ATT&CK tactic T1055, Process Injection or Accessing Privileged Resources via API calls, as well as the broader category of Defense Evasion techniques aimed at bypassing sandbox restrictions. Understanding these mappings helps security teams better detect similar patterns in future incidents and refine their monitoring strategies for browser-based exploits that target privilege escalation vectors within web applications.