CVE-2026-100801: Vulnerability in Mozilla Firefox
Privilege escalation in the DLL Services component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.
AI Analysis
Technical Summary
This vulnerability involves privilege escalation within the DLL Services component of Mozilla Firefox. It was identified and fixed by Mozilla in the ESR 153.4, Firefox 157, and ESR 140.17 releases. The vendor advisory confirms the fix and classifies the impact as high. There are no reports of active exploitation in the wild. The advisory is part of a broader set of high-impact security fixes released simultaneously.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to escalate privileges within the Firefox environment, potentially leading to unauthorized actions or access. However, no active exploitation has been observed.
Mitigation Recommendations
Users should update to Firefox ESR 153.4, Firefox 157, or Firefox ESR 140.17 or later to remediate this vulnerability. The vendor advisory confirms that the issue is fixed in these versions. No additional mitigation steps are indicated.
CVE-2026-100801: Vulnerability in Mozilla Firefox
Description
Privilege escalation in the DLL Services component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17.
CVSS v3.1
Score 8.8high
Affected software
Mozilla
Firefox
pkg:github/mozilla/firefoxRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves privilege escalation within the DLL Services component of Mozilla Firefox. It was identified and fixed by Mozilla in the ESR 153.4, Firefox 157, and ESR 140.17 releases. The vendor advisory confirms the fix and classifies the impact as high. There are no reports of active exploitation in the wild. The advisory is part of a broader set of high-impact security fixes released simultaneously.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to escalate privileges within the Firefox environment, potentially leading to unauthorized actions or access. However, no active exploitation has been observed.
Mitigation Recommendations
Users should update to Firefox ESR 153.4, Firefox 157, or Firefox ESR 140.17 or later to remediate this vulnerability. The vendor advisory confirms that the issue is fixed in these versions. No additional mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-09-26T19:17:46.301Z
- 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"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-99/","vendor":"Mozilla"}]
Threat ID: 6abbb3f3f7a7c541066409a1
Added to database: 09/29/2026, 12:49:55 UTC
Last enriched: 09/29/2026, 13:17:58 UTC
Last updated: 09/29/2026, 18:20:13 UTC
Views: 6
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