CVE-2026-84135: Vulnerability in Mozilla Firefox
Description
Other issue in Firefox Focus for Android. This vulnerability was fixed in Firefox 155.
CVSS v3.1
Score 9.8critical
Affected software
Mozilla
Firefox
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CVE-2026-84135, is an 'other issue' in Firefox Focus for Android. It was resolved in Firefox 155 alongside numerous other security vulnerabilities. The Mozilla advisory groups this issue with low-impact bugs fixed in the release. The overall CVSS score of 9.8 applies to the entire set of vulnerabilities fixed in Firefox 155, not specifically to this issue. No detailed technical exploit or attack vector is provided for this specific vulnerability. The fix is included in Firefox 155.
Potential Impact
The vulnerability could potentially allow information disclosure or other security-relevant defects in Firefox Focus for Android. However, the vendor advisory classifies the impact of this specific issue as low. There are no known exploits in the wild. The overall CVSS score of 9.8 reflects the combined impact of multiple vulnerabilities fixed in the same release, not this issue alone.
Mitigation Recommendations
This vulnerability is fixed in Firefox 155. Users and administrators should update to Firefox 155 or later to remediate this issue. No additional mitigation actions are required beyond applying the official update.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-01T07:25:44.495Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-82/","vendor":"Mozilla"}]
Threat ID: 6a96cab2acd9273b49b68589
Added to database: 09/01/2026, 12:53:06 UTC
Last enriched: 09/07/2026, 12:59:16 UTC
Last updated: 10/14/2026, 18:48:24 UTC
Views: 60
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