9.8CRITICAL

CVE-2025-8038 — Thunderbird ignored paths when checking the validity of navigations in a frame.

Mozilla · Firefox · Published 22 Jul 2025 · Modified 30 Sept 2026

Description

Thunderbird ignored paths when checking the validity of navigations in a frame. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1808979
https://www.mozilla.org/security/advisories/mfsa2025-56/
https://www.mozilla.org/security/advisories/mfsa2025-59/
https://www.mozilla.org/security/advisories/mfsa2025-61/
https://www.mozilla.org/security/advisories/mfsa2025-63/

What to do

Check whether Firefox is in your asset inventory.
Patch in the next maintenance window; prioritise internet-facing systems.
Record the decision in your risk register for audit evidence.

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Link: adminadda.com/cve/CVE-2025-8038