CVE-2026-100801
Privilege escalation in the DLL Services component
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
Privilege escalation in the DLL Services component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 159, Firefox ESR 153.6, Thunderbird 159, Thunderbird 153.6, Firefox 157, and Firefox ESR 140.17.
| Vendor | mozilla |
| Product | thunderbird |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 29, 2026 |
| Last Updated | Oct 27, 2026 |
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Affected Versions
Mozilla / Thunderbird
All versions affected Mozilla / Firefox
All versions affected References
bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=2057112 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-100/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-101/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-102/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-103/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-118/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-120/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-121/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-122/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-97/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2026-99/
Credits
Mozilla