Vulnerability Description
When replying to, forwarding, or editing a crafted email message as new, Thunderbird could embed parts of a different message stored in the same folder into the message being composed, without showing a blocked content warning. If the user sent the message, the content of the other message was disclosed to the recipients. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2081720
- https://www.mozilla.org/security/advisories/mfsa2026-121/
- https://www.mozilla.org/security/advisories/mfsa2026-122/
FAQ
What is CVE-2026-118175?
CVE-2026-118175 is a documented vulnerability. When replying to, forwarding, or editing a crafted email message as new, Thunderbird could embed parts of a different message stored in the same folder into the message being composed, without showing...
How severe is CVE-2026-118175?
CVSS scoring is not yet available for CVE-2026-118175. Check NVD for updates.
Is there a patch for CVE-2026-118175?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.