CVE-2026-100828: Vulnerability in Mozilla Firefox
Mitigation bypass in the Bookmarks & History component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
AI Analysis
Technical Summary
This vulnerability involves a mitigation bypass in the Bookmarks & History component of Mozilla Firefox. It was resolved by Mozilla in Firefox ESR 153.4 and Firefox 157 releases. The vendor advisory groups this issue among multiple high-impact security vulnerabilities fixed simultaneously. No further technical details about the exploitation method or root cause are provided in the advisory.
Potential Impact
The vulnerability has a high impact rating as per the vendor advisory, indicating it could potentially allow attackers to bypass security mitigations related to bookmarks and history management in Firefox. However, no active exploitation has been reported.
Mitigation Recommendations
Users and administrators should update to Firefox ESR 153.4 or Firefox 157 or later to remediate this vulnerability. The vendor has provided an official fix, and applying this update fully mitigates the issue.
CVE-2026-100828: Vulnerability in Mozilla Firefox
Description
Mitigation bypass in the Bookmarks & History component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
Affected software
Mozilla
Firefox
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a mitigation bypass in the Bookmarks & History component of Mozilla Firefox. It was resolved by Mozilla in Firefox ESR 153.4 and Firefox 157 releases. The vendor advisory groups this issue among multiple high-impact security vulnerabilities fixed simultaneously. No further technical details about the exploitation method or root cause are provided in the advisory.
Potential Impact
The vulnerability has a high impact rating as per the vendor advisory, indicating it could potentially allow attackers to bypass security mitigations related to bookmarks and history management in Firefox. However, no active exploitation has been reported.
Mitigation Recommendations
Users and administrators should update to Firefox ESR 153.4 or Firefox 157 or later to remediate this vulnerability. The vendor has provided an official fix, and applying this update fully mitigates the issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-26T19:18:55.211Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-100/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-97/","vendor":"Mozilla"}]
Threat ID: 6abbb3f9f7a7c541066409cb
Added to database: 09/29/2026, 12:50:01 UTC
Last enriched: 09/29/2026, 13:02:59 UTC
Last updated: 09/29/2026, 18:20:13 UTC
Views: 8
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.