CVE-2026-118175 Content of other messages could be included when replying to a crafted message
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-118175?
CVE-2026-118175 is a vulnerability in Mozilla Thunderbird, published on 27 Oct 2026.
Official 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.
Which versions are affected by CVE-2026-118175?
How do I fix CVE-2026-118175?
No fix has been published for CVE-2026-118175 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-118175 being exploited?
There is no known exploitation of CVE-2026-118175 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-118175, GHSA-wc7r-3c8h-4jrf, UBUNTU-CVE-2026-118175.