Input validation error in Firefox ESR - CVE-2026-8091

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Main Vulnerability Database Vulnerabilities #VU130582

Input validation error in Firefox ESR - CVE-2026-8091

Published: May 7, 2026


Vulnerability identifier: #VU130582
CSH Severity: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-8091
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Firefox ESR
Software vendor:
Mozilla

Description

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to improper input validation in the Audio/Video: Playback component when processing media content. A remote attacker can supply specially crafted media content to execute arbitrary code.

User interaction is required to visit a specially crafted website or open a specially crafted URL.


Remediation

Install security update from vendor's website.

External links