Detections
Analytics
CVE-2026-118175
medium
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://www.mozilla.org/security/advisories/mfsa2026-122/
https://www.mozilla.org/security/advisories/mfsa2026-121/