CVE-2026-2803: Vulnerability in Mozilla Firefox
Information disclosure, mitigation bypass in the Settings UI component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
AI Analysis
Technical Summary
CVE-2026-2803 is a high-severity vulnerability in Mozilla Firefox's Settings UI component that leads to information disclosure and mitigation bypass. The flaw does not require privileges or user interaction and has a CVSS 3.1 base score of 7.5. It was addressed in Firefox 148 alongside numerous other critical and high-impact vulnerabilities affecting various components such as JavaScript engine, graphics, sandbox escapes, and privilege escalations. The vendor advisory explicitly states the vulnerability is fixed in Firefox 148 and Thunderbird 148.
Potential Impact
Successful exploitation of this vulnerability could result in unauthorized disclosure of sensitive information from the Firefox Settings UI component. The vulnerability does not impact integrity or availability but can compromise confidentiality. There are no reports of active exploitation in the wild. The high CVSS score reflects the potential impact of information disclosure without user interaction or privileges.
Mitigation Recommendations
Mozilla has provided an official fix for CVE-2026-2803 in Firefox 148 and Thunderbird 148. Users and administrators should update to these versions or later to remediate this vulnerability. No additional mitigation steps are required beyond applying the official patch.
CVE-2026-2803: Vulnerability in Mozilla Firefox
Description
Information disclosure, mitigation bypass in the Settings UI component. This vulnerability was fixed in Firefox 148 and Thunderbird 148.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-2803 is a high-severity vulnerability in Mozilla Firefox's Settings UI component that leads to information disclosure and mitigation bypass. The flaw does not require privileges or user interaction and has a CVSS 3.1 base score of 7.5. It was addressed in Firefox 148 alongside numerous other critical and high-impact vulnerabilities affecting various components such as JavaScript engine, graphics, sandbox escapes, and privilege escalations. The vendor advisory explicitly states the vulnerability is fixed in Firefox 148 and Thunderbird 148.
Potential Impact
Successful exploitation of this vulnerability could result in unauthorized disclosure of sensitive information from the Firefox Settings UI component. The vulnerability does not impact integrity or availability but can compromise confidentiality. There are no reports of active exploitation in the wild. The high CVSS score reflects the potential impact of information disclosure without user interaction or privileges.
Mitigation Recommendations
Mozilla has provided an official fix for CVE-2026-2803 in Firefox 148 and Thunderbird 148. Users and administrators should update to these versions or later to remediate this vulnerability. No additional mitigation steps are required beyond applying the official patch.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-02-19T15:06:58.944Z
- Cvss Version
- null
- State
- PUBLISHED
Threat ID: 699daf72be58cf853bdde2b1
Added to database: 2/24/2026, 2:02:26 PM
Last enriched: 4/14/2026, 12:06:58 PM
Last updated: 5/26/2026, 7:55:27 AM
Views: 446
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