What’s Vulnerable › Vulnerabilities

CVE-2026-109782: Mitigation bypass in the File Handling component

• Severity: high (CVSS 8.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-13 · updated 2026-10-26
• Weakness: CWE-693

Description

Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5 and Thunderbird 153.5.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2067465
• https://www.mozilla.org/security/advisories/mfsa2026-108/
• https://www.mozilla.org/security/advisories/mfsa2026-110/

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