VulnerabilityDeferred

CVE-2026-109763

Mitigation bypass in the File Handling component.

UnscoredEPSS 0.17%

Does this matter?

Not yet scored. NVD analysis is pending; check back once CVSS and EPSS values are published.

Description

Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

CVSS: Not yet scored
EPSS: 0.17% probability · 6th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Source: security@mozilla.org

EPSS trend

EPSS moved from 0.2% on 14 October 2026 to 0.2% on 26 October 2026.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2072501
https://www.mozilla.org/security/advisories/mfsa2026-106/
https://www.mozilla.org/security/advisories/mfsa2026-108/
https://www.mozilla.org/security/advisories/mfsa2026-109/
https://www.mozilla.org/security/advisories/mfsa2026-110/

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.