Protection Mechanism Failure in Mozilla products - CVE-2026-6763
Published: April 21, 2026
Vulnerability identifier: #VU126669
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-6763
CWE-ID: CWE-693
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Mozilla Firefox
Firefox ESR
Firefox for Android
Mozilla Firefox
Firefox ESR
Firefox for Android
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass a security restriction.
The vulnerability exists due to improper restriction enforcement in the File Handling component when processing crafted file handling operations. A remote attacker can trigger the vulnerable behavior to bypass a security restriction.
How to mitigate CVE-2026-6763
Install security update from vendor's website.