CVE-2026-92055
Received Received - Intake

Privilege Escalation in Firefox DevTools

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: Mozilla Corporation

Description
Privilege escalation in the DevTools component. This vulnerability was fixed in Firefox 156 and Firefox ESR 153.3.

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-92055
EUVD
EUVD-2026-78518

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox 156
mozilla firefox_esr 153.3

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-269 The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

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Executive Summary

This is a privilege escalation vulnerability in Firefox's DevTools component. It allows an attacker with limited access to gain higher privileges, potentially taking control of the browser or executing arbitrary code. The issue was patched in Firefox 156 and Firefox ESR 153.3.

Detection Guidance

To detect this vulnerability, check the installed version of Firefox or Firefox ESR. Compare it against the fixed versions (Firefox 156 or Firefox ESR 153.3). Use commands like 'firefox --version' or 'apt list --installed | grep firefox' on Linux systems.

Impact Analysis

If exploited, this vulnerability could let an attacker with basic user access escalate privileges, steal sensitive data, install malware, or monitor your activities. Users running unpatched versions of Firefox are at risk.

Compliance Impact

The vulnerability allows privilege escalation through the DevTools component, which could lead to unauthorized access to sensitive data. This may impact compliance with GDPR by potentially exposing personal data and HIPAA by compromising protected health information if exploited.

Mitigation Strategies

Immediately update Firefox to version 156 or Firefox ESR to version 153.3 or later. Disable DevTools if not required. Regularly monitor for updates from Mozilla to ensure ongoing protection.

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