Privilege escalation due to use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact total

Affected Vendors & Products

Vendors Products
Mozilla
  • Firefox
  • Thunderbird

Configuration 1 [-]

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

No data.

References
Link Providers
https://bugzilla.mozilla.org/show_bug.cgi?id=2050542 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-100797 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-100797 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-100/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-101/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-102/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-102/#CVE-2026-100797 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-103/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-97/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-98/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-99/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-99/#CVE-2026-100797 cve-icon
History

Mon, 19 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla thunderbird
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Vendors & Products Mozilla thunderbird

Tue, 06 Oct 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-825
References
Metrics threat_severity

None

 threat_severity

Moderate

Wed, 30 Sep 2026 17:45:00 +0000

Type Values Removed Values Added
Description Privilege escalation due to use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. Privilege escalation due to use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
References

Wed, 30 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Description Privilege escalation due to use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17. Privilege escalation due to use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
References

Tue, 29 Sep 2026 16:00:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Vendors & Products Mozilla
Mozilla firefox

Tue, 29 Sep 2026 14:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-416
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Tue, 29 Sep 2026 13:15:00 +0000

Type Values Removed Values Added
Description Privilege escalation due to use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Title Privilege escalation due to use-after-free in the Graphics: WebRender component
References
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published: 2026-09-29T12:36:16.796Z

Updated: 2026-09-30T17:20:39.680Z

Reserved: 2026-09-26T19:17:35.856Z

Link: CVE-2026-100797

cve-icon Vulnrichment

Updated: 2026-09-29T13:22:21.793Z

cve-icon NVD

Status : Analyzed

Published: 2026-09-29T13:17:44.760

Modified: 2026-10-19T15:22:31.947

Link: CVE-2026-100797

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-29T12:36:16Z

Links: CVE-2026-100797 - Bugzilla