CVE-2026-109770

6.1Medium

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

6.1Medium

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required
Impact: Limited impact
Weakness: CWE-20

Impact

Remote attackers can spoof Web Serial interface components to mislead users or tamper with data across security boundaries. Exploitation requires a user to visit a malicious site or open crafted content.

Root cause

Improper input validation allows spoofing within the DOM: Web Serial API component.

Affected systems

Firefox prior to 158, Firefox ESR prior to 153.5, Thunderbird prior to 158, and Thunderbird ESR prior to 153.5.

CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Fix & remediation

Upgrade to Firefox 158, Firefox ESR 153.5, Thunderbird 158, or Thunderbird 153.5. No interim mitigations are provided, so prioritize package updates.

shell

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

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

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NVD description

Spoofing issue in the DOM: Web Serial component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-109770