CVE-2026-16394: Vulnerability in Mozilla Firefox
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 153.
AI Analysis
Technical Summary
CVE-2026-16394 is a mitigation bypass vulnerability affecting the DOM security component in Mozilla Firefox. The vulnerability was publicly disclosed and fixed in Firefox 153 as part of a security advisory (MFSA2026-68) that addressed numerous security issues. The vendor advisory categorizes this vulnerability as having moderate impact. No detailed technical exploitation methods or attack vectors are provided in the advisory. The fix is included in Firefox 153, indicating that versions prior to 153 are affected.
Potential Impact
The vulnerability allows bypassing security mitigations within the DOM security component, which could potentially weaken the browser's security posture. The vendor rates the impact as moderate. There are no reports of active exploitation in the wild. The overall risk is mitigated by the availability of the fix in Firefox 153.
Mitigation Recommendations
Users and administrators should upgrade to Mozilla Firefox version 153 or later to remediate this vulnerability. Mozilla has officially fixed this issue in Firefox 153 as part of their security advisory MFSA2026-68. No additional mitigation actions are required beyond applying the official update.
CVE-2026-16394: Vulnerability in Mozilla Firefox
Description
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 153.
CVSS v3.1
Score 9.1critical
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-16394 is a mitigation bypass vulnerability affecting the DOM security component in Mozilla Firefox. The vulnerability was publicly disclosed and fixed in Firefox 153 as part of a security advisory (MFSA2026-68) that addressed numerous security issues. The vendor advisory categorizes this vulnerability as having moderate impact. No detailed technical exploitation methods or attack vectors are provided in the advisory. The fix is included in Firefox 153, indicating that versions prior to 153 are affected.
Potential Impact
The vulnerability allows bypassing security mitigations within the DOM security component, which could potentially weaken the browser's security posture. The vendor rates the impact as moderate. There are no reports of active exploitation in the wild. The overall risk is mitigated by the availability of the fix in Firefox 153.
Mitigation Recommendations
Users and administrators should upgrade to Mozilla Firefox version 153 or later to remediate this vulnerability. Mozilla has officially fixed this issue in Firefox 153 as part of their security advisory MFSA2026-68. No additional mitigation actions are required beyond applying the official update.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-07-20T21:57:19.701Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-68/","vendor":"Mozilla"}]
Threat ID: 6a5f6cc12a4a8d598926291f
Added to database: 07/21/2026, 12:57:37 UTC
Last enriched: 07/21/2026, 13:14:54 UTC
Last updated: 07/21/2026, 21:09:47 UTC
Views: 4
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