CVE-2026-106016 Firefox - Mitigation Bypass

Firefox contains a mitigation bypass caused by a flaw in the File Handling component, letting attackers bypass security mitigations, exploit requires no special conditions.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.32% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Mitigation Bypass
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
6 October 2026
Updated
15 October 2026
Weakness
CWE-693

Vendor fix

Update to version 157.0.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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