CVE-2026-95314 in Chrome
Summary
by MITRE • 09/29/2026
Incorrect authorization in HID in Google Chrome prior to 154.0.8037.57 allowed a remote attacker who had compromised the renderer process to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified as an incorrect authorization issue within Google Chrome prior to version 154.0.8037.57 represents a critical failure in the browser's internal permission model, specifically affecting how the Host Interface or similar high-level interfaces handle access control for compromised renderer processes. In modern web browsers like Chromium-based engines, security is maintained through a sandboxed architecture where each tab and extension runs in an isolated process known as the renderer. This design ensures that malicious code executed within a webpage cannot directly interact with the user's operating system or other browser components without explicit permission from the browser shell. However, this specific flaw allowed a remote attacker who had already achieved execution of arbitrary code within a compromised renderer process to bypass these established security boundaries. By crafting a specialized HTML page containing carefully constructed scripts and DOM manipulations, an adversary could exploit logic errors in how Chrome validated requests originating from lower-privilege contexts against higher-privilege system resources or internal APIs.
From a technical perspective, this vulnerability falls under the category of improper privilege management where the browser failed to correctly verify whether the requesting entity possessed the necessary authorization level for the specific operation being attempted. The attacker leveraged crafted HTML elements and JavaScript methods that triggered internal functions without proper checks on the origin or integrity of the calling context. This type of flaw is commonly associated with CWE-269, which denotes Improper Privilege Management, as it involves a situation where an actor obtains elevated privileges through misconfigured permissions rather than exploiting a buffer overflow or memory corruption bug directly. The attack vector relies heavily on social engineering or drive-by download techniques to get the victim to load the malicious page, after which the browser's own logic is tricked into granting access that should have been denied based on the renderer's sandboxed status.
The operational impact of this vulnerability is significant because it effectively neutralizes one of the primary defenses against web-based attacks: process isolation. Once an attacker can bypass these system access restrictions, they gain the ability to interact with sensitive browser features such as clipboard access, file system interactions via specific APIs, or potentially escalate their foothold within the user's environment depending on how Chrome exposes certain interfaces at that version level. This could lead to data exfiltration, installation of persistent malware, or further lateral movement if combined with other vulnerabilities in adjacent applications running under the same user context. The Chromium security team classified this issue as Medium severity because while it allows for privilege escalation within the browser's ecosystem, it typically requires a successful initial compromise of the renderer process through another vector such as an XSS vulnerability or malicious script execution on a third-party site.
To mitigate the risks associated with this flaw, users and administrators must ensure that Google Chrome is updated to version 154.0.8037.57 or later immediately upon availability. This patch contains the necessary code changes to enforce stricter authorization checks when handling requests from renderer processes to internal interfaces. Additionally, organizations should employ browser hardening techniques such as disabling unnecessary plugins and extensions that might increase the attack surface for initial compromise. Implementing content security policies (CSP) can also help mitigate the likelihood of an attacker successfully executing arbitrary JavaScript within a page, thereby reducing the probability of reaching this specific authorization bypass stage. Monitoring network traffic for unusual outbound connections from browser processes may also aid in detecting exploitation attempts in real-time before significant damage occurs.
In terms of threat intelligence frameworks, this vulnerability aligns with MITRE ATT&CK technique T1059, specifically Command and Scripting Interpreter: JavaScript, as the initial execution mechanism, followed by T1211 Exploitation for Privilege Escalation where the attacker leverages the flaw to gain higher-level access within the application environment. Understanding this context helps security teams prioritize patching efforts based on the likelihood of exploitation in their specific environments and the sensitivity of data handled through affected browsers. Regular auditing of browser configurations and keeping software up to date remain the most effective defenses against such logic-based vulnerabilities that target the core trust boundaries of modern web applications.