CVE-2026-100808: Vulnerability in Mozilla Firefox
Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
AI Analysis
Technical Summary
CVE-2026-100808 is a vulnerability in Mozilla Firefox's DOM: Service Workers component that allows a mitigation bypass. This flaw was resolved in Firefox ESR 153.4 and Firefox 157. The Mozilla Foundation Security Advisory rates the impact as high. The advisory is part of a broader set of fixes addressing multiple high-impact vulnerabilities in Firefox ESR 153.4. There is no indication of active exploitation in the wild.
Potential Impact
The vulnerability allows bypassing mitigations in the Service Workers component of the DOM, which could potentially lead to security issues affecting the browser's integrity or user security. The Mozilla advisory classifies the impact as high, indicating a serious security concern if left unpatched. However, no active exploitation has been reported.
Mitigation Recommendations
A fix is available and has been released in Firefox ESR 153.4 and Firefox 157. Users and administrators should update to these versions or later to remediate this vulnerability. No additional mitigation actions are indicated by the vendor advisory.
CVE-2026-100808: Vulnerability in Mozilla Firefox
Description
Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
Affected software
Mozilla
Firefox
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-100808 is a vulnerability in Mozilla Firefox's DOM: Service Workers component that allows a mitigation bypass. This flaw was resolved in Firefox ESR 153.4 and Firefox 157. The Mozilla Foundation Security Advisory rates the impact as high. The advisory is part of a broader set of fixes addressing multiple high-impact vulnerabilities in Firefox ESR 153.4. There is no indication of active exploitation in the wild.
Potential Impact
The vulnerability allows bypassing mitigations in the Service Workers component of the DOM, which could potentially lead to security issues affecting the browser's integrity or user security. The Mozilla advisory classifies the impact as high, indicating a serious security concern if left unpatched. However, no active exploitation has been reported.
Mitigation Recommendations
A fix is available and has been released in Firefox ESR 153.4 and Firefox 157. Users and administrators should update to these versions or later to remediate this vulnerability. No additional mitigation actions are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-26T19:18:04.141Z
- 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: 6abbb3f5f7a7c541066409af
Added to database: 09/29/2026, 12:49:57 UTC
Last enriched: 09/29/2026, 13:04:05 UTC
Last updated: 09/29/2026, 18:20:13 UTC
Views: 7
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.