Input validation error in Firefox ESR - CVE-2026-7321
Published: April 28, 2026
Vulnerability identifier: #VU128409
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-7321
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Firefox ESR
Firefox ESR
Software vendor:
Mozilla
Mozilla
Description
The vulnerability allows a remote attacker to escape the sandbox.
The vulnerability exists due to incorrect boundary conditions in the WebRTC: Networking component when handling WebRTC network traffic. A remote attacker can trigger specially crafted WebRTC network interactions to escape the sandbox.
User interaction is required to visit a specially crafted website or URL.
Remediation
Install security update from vendor's website.