Privilege Escalation in Firefox WebExtensions

Executive Summary

This is a privilege escalation vulnerability in Firefox's WebExtensions component. It allows an attacker with limited permissions to gain higher privileges within the browser. The issue was patched in Firefox 156 and multiple Firefox ESR versions.

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Detection Guidance

This vulnerability is specific to Firefox and its ESR versions. To detect it, check the installed Firefox version on your system. If you are running Firefox 155 or lower, Firefox ESR 115.40 or lower, Firefox ESR 140.15 or lower, or Firefox ESR 153.2 or lower, your system is vulnerable.

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Impact Analysis

If exploited, this vulnerability could let an attacker bypass security restrictions, install malicious extensions, or access sensitive data in your browser. Users running unpatched Firefox versions are at risk.

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Compliance Impact

The provided CVE data does not specify direct impacts on compliance with standards like GDPR or HIPAA. However, privilege escalation vulnerabilities can potentially lead to unauthorized access to sensitive data, which may violate confidentiality requirements in GDPR and HIPAA.

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Mitigation Strategies

Update Firefox to version 156 or later, Firefox ESR to version 115.41 or later, Firefox ESR to version 140.16 or later, or Firefox ESR to version 153.3 or later to address the privilege escalation in WebExtensions.

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