CVE-2025-68508 in Brave Plugin
Summary
by MITRE • 12/24/2025
Missing Authorization vulnerability in Brave Brave brave-popup-builder allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Brave: from n/a through <= 0.8.3.
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Analysis
by VulDB Data Team • 12/24/2025
The CVE-2025-68508 vulnerability represents a critical missing authorization flaw within the brave-popup-builder component of the Brave browser ecosystem. This security weakness stems from incorrectly configured access control security levels that fail to properly validate user permissions before granting access to sensitive functionalities. The vulnerability exists in Brave versions up to and including 0.8.3, indicating a widespread impact across multiple releases of this popup builder utility. The flaw essentially allows unauthorized access to resources or operations that should be restricted to authorized users or processes, creating a significant security risk for any system utilizing this component.
The technical implementation of this vulnerability manifests through improper access control validation mechanisms within the brave-popup-builder module. When the popup builder processes requests or operations, it fails to adequately verify whether the requesting entity possesses the necessary authorization credentials or privileges. This misconfiguration creates a pathway for malicious actors to bypass intended security controls and access restricted functionalities. The vulnerability aligns with CWE-285, which specifically addresses improper authorization issues in software systems, where access control mechanisms fail to properly enforce security policies. The flaw demonstrates a fundamental breakdown in the principle of least privilege, where users or processes may access resources beyond their designated permissions.
The operational impact of this vulnerability extends beyond simple unauthorized access, potentially enabling attackers to manipulate popup behavior, access sensitive data, or execute malicious code through the compromised popup builder component. In the context of browser security, popup builders are critical components that handle user interactions and may interface with system resources or sensitive information. The vulnerability creates opportunities for privilege escalation attacks, where an attacker could leverage the missing authorization controls to gain elevated privileges or access to confidential information. This risk is particularly concerning in environments where Brave browser components interact with enterprise systems or handle sensitive user data.
Security professionals should consider this vulnerability in relation to ATT&CK framework techniques such as T1078 for valid accounts and T1566 for credential access, as the missing authorization could enable attackers to exploit legitimate user credentials or create new unauthorized access points. The vulnerability also relates to T1068 for exploit for privilege escalation, as unauthorized access to popup builder functionalities may provide pathways to broader system compromise. Organizations should prioritize immediate remediation by updating to versions of Brave that address this authorization flaw, while implementing additional monitoring for suspicious popup behavior or unauthorized access attempts. The fix should include comprehensive access control validation mechanisms that properly enforce authorization policies and prevent unauthorized operations within the popup builder component.
The root cause of this vulnerability highlights the importance of rigorous security testing and access control validation in browser extension and utility components. Software development practices should emphasize proper authorization implementation, including thorough testing of access control mechanisms and adherence to security standards such as those defined by NIST SP 800-53 for access control requirements. Regular security assessments and penetration testing of browser components can help identify similar authorization flaws before they can be exploited in the wild, ensuring that security controls remain robust against evolving threat landscapes.