CVE-2026-118178 RSS feed could redirect its subscription to a local file or network share
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-118178?
CVE-2026-118178 is a vulnerability in Mozilla Thunderbird, published on 27 Oct 2026.
Official description
A remote RSS feed could use the itunes:new-feed-url or newLocation element to permanently change its stored subscription URL to a file: URL. Thunderbird then read that location on every feed update. This allowed a malicious feed, or an attacker able to modify a feed delivered over HTTP, to make Thunderbird read local files and, on Windows, connect to an attacker-controlled network share, which could leak the user's NTLM credentials. The NTLM credential leak only affects Thunderbird on Windows. Other operating systems are affected by the local file read only. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.
Which versions are affected by CVE-2026-118178?
How do I fix CVE-2026-118178?
No fix has been published for CVE-2026-118178 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-118178 being exploited?
There is no known exploitation of CVE-2026-118178 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-118178, GHSA-6j4v-p75m-p9wm, UBUNTU-CVE-2026-118178.