CVE-2026-121172 in Chrome
Summary
by MITRE • 11/03/2026
Incorrect authorization in Isolated in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to spoof UI elements via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 11/03/2026
The vulnerability identified as an incorrect authorization flaw within the Chromium engine, specifically affecting versions of Google Chrome prior to 157.0.8103.38, represents a significant breach in user interface integrity and trust boundaries. This issue stems from a failure in the browser's internal access control mechanisms when handling specific HTML content rendered by remote servers. The core technical flaw involves an improper validation of permissions or context isolation rules that govern how web pages interact with privileged browser interfaces. When a malicious actor constructs an HTML page designed to exploit this logic error, they can bypass standard security checks that are intended to prevent untrusted scripts from mimicking legitimate system dialogs or UI components. This type of vulnerability is classified under CWE-269, which denotes Improper Control of Interaction with Unintended Entity, as the application fails to properly verify the source and intent of actions affecting its user interface elements.
From an operational perspective, this flaw enables a remote attacker to perform User Interface spoofing attacks against unsuspecting users. By crafting a specific HTML page that leverages the authorization gap, an adversary can overlay fake login prompts, warning messages, or system notifications onto legitimate web content. This technique is highly effective in social engineering campaigns because it exploits the user's trust in the browser interface itself rather than just the website content. If a victim interacts with these spoofed elements by entering credentials or clicking malicious links within the fabricated UI, sensitive information such as passwords, session tokens, or personal data can be exfiltrated to an attacker-controlled server. The severity is rated as Low because successful exploitation typically requires user interaction and does not directly lead to arbitrary code execution or full system compromise on its own, but it serves as a potent vector for credential harvesting and further phishing attacks.
In the context of cyber threat intelligence frameworks, this vulnerability aligns with ATT&CK technique T1089, Disabling Security Tools, although more accurately it maps to T1566.002, Spearphishing Link, or specifically UI redressing techniques often associated with T1071 Application Layer Protocol abuse in the context of deceptive interfaces. The ability to spoof UI elements undermines the fundamental security assumption that what a user sees on their screen is an accurate representation of the underlying application state and origin. This erosion of trust can lead to broader organizational risks, including compromised accounts within enterprise environments if employees are tricked into authenticating against fake portals hosted via this method.
Mitigation for this vulnerability requires immediate action by updating the browser software to version 157.0.8103.38 or later, where the authorization logic has been corrected and proper context isolation is enforced. For organizations managing large fleets of endpoints, deploying automated patch management solutions ensures that all instances are updated promptly to close this attack surface. Additionally, security awareness training should be emphasized to help users recognize signs of UI spoofing, such as unexpected pop-ups or inconsistencies in URL bars during authentication flows. While technical controls like Content Security Policy headers can mitigate some cross-origin risks, they do not fully prevent local DOM manipulation attacks that exploit browser engine flaws; therefore, keeping the browser binary itself up to date remains the most effective defense against this specific class of interface integrity violations.