CVE-2026-106372 in Chrome
Summary
by MITRE • 10/07/2026
Incorrect authorization in UI in Google Chrome prior to 155.0.8059.39 allowed a remote attacker to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an incorrect authorization issue within the user interface of Google Chrome prior to version 155.0.8059.39 represents a critical failure in access control mechanisms that governs how browser components interact with underlying system resources and external entities. This flaw specifically resides in the logic responsible for validating permissions or privileges when processing web content, allowing an attacker who crafts a malicious HTML page to bypass intended security restrictions. The core technical deficiency lies in the improper enforcement of authorization checks during the rendering or execution phases of web pages, which creates a pathway for privilege escalation from the restricted browser sandbox environment to the host operating system. By exploiting this misconfiguration, a remote attacker can trick the user into visiting a specially constructed webpage that triggers the flawed logic, thereby gaining unauthorized access to resources and capabilities that should remain isolated within the secure browsing context.
From an operational perspective, the impact of this vulnerability is severe because it undermines the fundamental security model of modern web browsers, which relies heavily on sandboxing to contain potential threats. When a remote attacker successfully executes arbitrary code outside the sandbox, they effectively neutralize one of the primary defenses against malware and exploit kits. This allows for full system compromise, including the ability to read sensitive data such as passwords, cookies, and personal files, install persistent backdoors, or use the compromised machine as part of a botnet. The severity is classified as medium by Chromium security standards because while it requires user interaction in the form of visiting a crafted page, the resulting impact extends beyond simple information disclosure into full remote code execution with elevated privileges relative to the browser process.
This type of vulnerability aligns closely with CWE-269, which describes Improper Privilege Assignment, as well as CWE-862, Missing Authorization, indicating that the software did not properly verify whether the user or application had the necessary rights to perform an action before allowing it. In terms of offensive security frameworks such as MITRE ATT&CK, this exploit technique corresponds to T1059 Command and Scripting Interpreter for code execution and potentially T1218 System Binary Proxy Execution if the attacker leverages legitimate system tools after gaining initial access. The attack vector is classified as remote via network (T1190), requiring no physical or local presence, which significantly increases its potential prevalence in automated scanning campaigns targeting outdated browser versions.
To mitigate this risk, organizations and individual users must ensure that Google Chrome is updated to version 155.0.8059.39 or later immediately upon availability. Since the vulnerability can be triggered by simply visiting a malicious website, passive defense mechanisms such as endpoint detection and response tools should be configured to monitor for unusual process creation events originating from browser processes attempting to spawn external executables or access restricted memory regions. Additionally, implementing strict content security policies and disabling unnecessary plugins or features that might expand the attack surface can provide additional layers of protection against similar exploitation attempts until the patch is fully deployed across all endpoints.