CVE-2026-100801

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-100801
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.

8.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=2057112 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-100/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-101/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-102/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-103/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-118/
https://www.mozilla.org/security/advisories/mfsa2026-120/
https://www.mozilla.org/security/advisories/mfsa2026-121/
https://www.mozilla.org/security/advisories/mfsa2026-122/
https://www.mozilla.org/security/advisories/mfsa2026-97/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-99/ Vendor Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
History

27 Oct 2026, 19:17

Type Values Removed Values Added
Summary (en) 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, Firefox 157, and Firefox ESR 140.17. (en) 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.
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-121/ -
  • () https://www.mozilla.org/security/advisories/mfsa2026-122/ -

27 Oct 2026, 14:16

Type Values Removed Values Added
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-118/ -
  • () https://www.mozilla.org/security/advisories/mfsa2026-120/ -
Summary (en) 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 157, and Firefox ESR 140.17. (en) 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, Firefox 157, and Firefox ESR 140.17.

19 Oct 2026, 17:51

Type Values Removed Values Added
CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
First Time Mozilla thunderbird
Mozilla
Mozilla firefox
References () https://bugzilla.mozilla.org/show_bug.cgi?id=2057112 - () https://bugzilla.mozilla.org/show_bug.cgi?id=2057112 - Permissions Required
References () https://www.mozilla.org/security/advisories/mfsa2026-100/ - () https://www.mozilla.org/security/advisories/mfsa2026-100/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-101/ - () https://www.mozilla.org/security/advisories/mfsa2026-101/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-102/ - () https://www.mozilla.org/security/advisories/mfsa2026-102/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-103/ - () https://www.mozilla.org/security/advisories/mfsa2026-103/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-97/ - () https://www.mozilla.org/security/advisories/mfsa2026-97/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-99/ - () https://www.mozilla.org/security/advisories/mfsa2026-99/ - Vendor Advisory

30 Sep 2026, 18:18

Type Values Removed Values Added
Summary (en) Privilege escalation in the DLL Services component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, and Firefox ESR 140.17. (en) 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 157, and Firefox ESR 140.17.
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-101/ -
  • () https://www.mozilla.org/security/advisories/mfsa2026-102/ -
  • () https://www.mozilla.org/security/advisories/mfsa2026-103/ -

29 Sep 2026, 14:17

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 8.8
CWE CWE-269

29 Sep 2026, 13:17

Type Values Removed Values Added
New CVE
Information

Published : 2026-09-29 13:17

Updated : 2026-10-27 19:17

NVD link : CVE-2026-100801

Mitre link : CVE-2026-100801

CVE.ORG link : CVE-2026-100801

JSON object : View

Products Affected

mozilla

  • firefox
  • thunderbird
CWE
CWE-269

Improper Privilege Management