CVE-2026-121067 in Chrome
Summary
by MITRE • 11/03/2026
UI misrepresentation in PermissionElement in Google Chrome prior to 157.0.8103.38 allowed a remote attacker leveraging social engineering to spoof UI elements via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 11/03/2026
The vulnerability identified as a user interface misrepresentation within the PermissionElement component of Google Chrome prior to version 157.0.8103.38 represents a significant trust boundary violation that undermines the integrity of browser-based permission prompts. This flaw allows for UI spoofing, where an attacker can manipulate the visual presentation of security-critical dialogs to deceive users into granting unauthorized access to sensitive resources such as camera, microphone, location services, or clipboard data. By crafting specific HTML pages that exploit rendering inconsistencies or logic errors in how permissions are requested and displayed, malicious actors can create a false sense of legitimacy around these prompts. This technique relies heavily on social engineering, where the attacker tricks the user into interacting with what appears to be a standard browser permission request but is actually part of a deceptive interface designed to harvest credentials or surveillance data without explicit informed consent.
From a technical perspective, this issue falls under the category of UI Redressing and Clickjacking variants as defined by Common Weakness Enumeration standards, specifically aligning with CWE-1021 Improper Restriction of Rendered UI Layers and potentially CWE-798 if it leads to unauthorized access through deceptive means. The core flaw lies in the browser's inability to correctly isolate or authenticate the origin of certain permission dialogs when embedded within complex web contexts. When a user encounters a prompt that mimics native system-level notifications but is actually rendered by malicious script, they may inadvertently authorize actions that compromise their privacy and security posture. This misrepresentation exploits the cognitive gap between what users perceive as secure browser behavior and the actual underlying code execution environment, effectively bypassing the intended protective mechanisms of the permission model.
The operational impact of this vulnerability extends beyond immediate data theft to include long-term erosion of user trust in web applications and browsers. If successful, an attacker could gain persistent access to sensitive hardware interfaces or personal information by convincing users that granting permissions is necessary for a benign activity, such as viewing content on a legitimate-looking website. This can lead to severe consequences including identity theft, financial fraud through unauthorized transactions facilitated by clipboard manipulation, or corporate espionage if used in phishing campaigns targeting employees with elevated privileges. The medium severity rating assigned by the Chromium security team reflects the potential for widespread exploitation due to the ease of crafting such pages and the high likelihood of user error when faced with sophisticated social engineering tactics that mimic trusted interfaces.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. Users should immediately update Google Chrome to version 157.0.8103.38 or later, where these rendering inconsistencies have been addressed by the development team through stricter validation of permission request origins and enhanced isolation of UI elements from malicious script injection. Additionally, security awareness training is critical to help users recognize subtle signs of UI spoofing, such as mismatched domain names in address bars during prompts or unusual visual artifacts in dialog boxes. Browser vendors continue to refine their rendering engines to ensure that all permission requests are visually distinct and clearly attributed to the correct origin, reducing the attack surface for social engineering attacks that rely on visual deception. Monitoring browser security advisories and enabling automatic updates further reduces exposure to such vulnerabilities by ensuring timely application of patches before they can be widely exploited in the wild.