CVE-2026-117864

CVE Details

Release Date:	2026-10-27
Impact:	Important	What is this?

Description

Sandbox escape in the Form Manager component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

See more information about CVE-2026-117864 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	7.8
Vector String:	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Version:	3.1
Attack Vector:	Local
Attack Complexity:	High
Privileges Required:	Low
User Interaction:	None
Scope:	Changed
Confidentiality Impact:	High
Integrity Impact:	High
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 10 (firefox)	ELSA-2026-93956	2026-11-03
Oracle Linux version 8 (firefox)	ELSA-2026-94405	2026-11-03
Oracle Linux version 9 (firefox)	ELSA-2026-93957	2026-11-03