CVE-2026-109772

—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 the same-origin policy through browser DevTools to access cross-origin data. Exploitation requires convincing a user to open malicious content or interact with DevTools.

Root cause

A logic flaw in the DevTools component fails to enforce origin boundaries.

Affected systems

Firefox versions prior to 158 and Thunderbird versions prior to 158.

Fix & remediation

Upgrade Firefox and Thunderbird to version 158 or later. No interim mitigation is documented, so patching is required.

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?

Ad · In-content banner

NVD description

Same-origin policy bypass in the DevTools component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-109772