Live › vulnerability › CVE-2026-118178
Go to dashboardA malicious RSS feed can use the itunes:new-feed-url or newLocation element to permanently change its stored subscription URL to a file: location, so Thunderbird reads that local file on every update. On Windows, the same redirect can point at an attacker-controlled network share and leak the user's NTLM credentials.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-27 19:33 UTC. All times on this page are UTC.
Thunderbird users who subscribe to RSS or news feeds, where a remote feed or an attacker able to alter a feed delivered over HTTP can supply the redirect. The NTLM credential leak applies only to Windows installs; other operating systems face the local file read only. Users who do not use RSS feed subscriptions are not exposed through this path.
No product ranges from the sources yet.
thunderbird --version on the command line159 or 153.6, or a later release of either lineEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
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