What’s Vulnerable › Vulnerabilities

CVE-2026-106016: Mitigation bypass in the File Handling component

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-13
• Weakness: CWE-693

Description

Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 157.0.1 and Thunderbird 158.

Affected products

• Mozilla Firefox: before 157.0.1 — fixed in 157.0.1

How to fix

Upgrade to a fixed version: Mozilla Firefox 157.0.1. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2067465
• https://www.mozilla.org/security/advisories/mfsa2026-104/
• https://www.mozilla.org/security/advisories/mfsa2026-109/

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