CVE-2026-121225 in Chrome
Summary
by MITRE • 11/03/2026
Incorrect authorization in Permissions in Google Chrome prior to 157.0.8103.38 allowed a remote attacker leveraging social engineering to bypass system access restrictions 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 issue within the permissions subsystem of Google Chrome prior to version 157.0.8103.38 represents a flaw in how the browser validates and enforces access controls for sensitive system resources or APIs. This specific defect allows a remote attacker, who typically relies on social engineering tactics such as phishing or malicious web content delivery, to bypass established security restrictions that are designed to limit user interaction with certain features like camera, microphone, location services, or clipboard access. The core technical flaw lies in the logic governing permission grants and checks, where the browser fails to correctly verify whether a specific origin has been explicitly authorized by the user for a particular action before allowing it to proceed. This misconfiguration effectively creates an authorization bypass scenario where malicious scripts embedded within a crafted HTML page can execute privileged operations without triggering the standard consent dialogs or failing due to lack of permission.
From a technical perspective, this vulnerability exploits weaknesses in the browser's security model regarding origin isolation and privilege escalation at the application layer. When a user visits a compromised website, the attacker crafts an HTML document that attempts to access restricted APIs. Due to the authorization error, Chrome incorrectly assumes or allows these requests to succeed even when they should be denied based on prior user decisions or default deny policies. This bypass is particularly dangerous because it undermines one of the primary defenses against cross-site scripting and malicious content execution: the explicit consent mechanism. By circumventing this check, an attacker can potentially exfiltrate sensitive data, record audio or video without detection, or manipulate system state in ways that compromise user privacy and integrity. The Chromium security team has classified this issue with a low severity rating, likely reflecting its dependency on social engineering for initial access rather than being exploitable purely through automated remote code execution vectors against unpatched systems without user interaction.
The operational impact of this vulnerability is significant despite the low classification, primarily because it affects the trust model users place in their web browser. If an attacker successfully leverages this flaw, they can gain unauthorized access to personal information and hardware resources that are typically protected by strict permission boundaries. This could lead to privacy violations such as unauthorized surveillance via webcam or microphone activation, theft of sensitive text from clipboard operations, or tracking user location data without consent. Furthermore, the ability to bypass these restrictions facilitates more sophisticated attack chains where initial footholds gained through phishing can be expanded into deeper system compromise if combined with other vulnerabilities. The reliance on social engineering means that while the technical exploit is contained within the browser environment, its success rate depends heavily on human factors, making it a persistent threat in enterprise and personal computing environments alike.
To mitigate this risk, organizations and individual users must ensure that Google Chrome is updated to version 157.0.8103.38 or later as soon as possible. This update contains the necessary patches to correct the authorization logic within the permissions subsystem, ensuring that access requests are properly validated against user preferences and security policies before execution. In addition to patching, administrators should enforce strict content security policies and utilize browser hardening techniques such as disabling unnecessary APIs where they are not required for business operations. User education remains critical; since this vulnerability requires social engineering to trigger, training users to recognize suspicious websites and avoid granting permissions to untrusted sources can significantly reduce the attack surface. Monitoring browser logs for unusual permission requests or unauthorized access patterns can also aid in early detection of exploitation attempts.
This incident aligns with common weakness enumerations related to improper authorization controls, specifically CWE-285 which describes Improper Authorization, and relates to ATT&CK techniques involving initial access through spearphishing links followed by defense evasion via browser-based persistence or data exfiltration methods that rely on bypassing user consent mechanisms. By addressing the underlying code defect in Chrome's permission handling logic, developers restore the integrity of the security boundary between web content and local system resources, thereby preventing attackers from leveraging trusted applications to perform unauthorized actions. Continuous monitoring for new CVEs affecting browser components is essential as these tools remain a primary vector for cyber attacks targeting both individual consumers and corporate networks.