CVE-2026-109782

—Unscored

Published 13 Oct 2026 · NVD status: Deferred · AI triage by gemini-3.8-flash

—Unscored

Attack vector: —
Complexity: —
Privileges needed: —
User interaction: —
Impact: —
Weakness: —

Impact

Attackers can bypass security protections in file handling, typically requiring a user to open an untrusted file or link. This can lead to unauthorized file actions or further system compromise depending on how files are processed.

Root cause

A mitigation bypass flaw exists in the file handling component.

Affected systems

Firefox ESR versions prior to 153.5 and Thunderbird versions prior to 153.5.

Fix & remediation

Upgrade to Firefox ESR 153.5 and Thunderbird 153.5 or later. No interim mitigation is provided.

shell

$ sudo apt-get update && sudo apt-get install --only-upgrade firefox-esr thunderbird

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD description

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

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-109782