Quick answers
- Is CVE-2026-118179 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-118179 being exploited in the wild.
- How severe is CVE-2026-118179?
- Informational severity, published 27 October 2026.
- Which products and versions are affected?
- Mozilla Thunderbird before 159 and before 153.6.
- Is there a fix for CVE-2026-118179?
- Yes: fixed in Thunderbird 159, Thunderbird 153.6. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-118179 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-118179?
- Check whether you run Mozilla Thunderbird at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: Thunderbird 159, Thunderbird 153.6
Technical details
The vulnerability is a request forgery flaw in Thunderbird's news: and snews: URI scheme handler. When a user clicks a malicious news: or snews: link containing a message-ID, Thunderbird connects to the attacker-specified host and port without validation or user confirmation, even if that server is not a configured news server. Additionally, line breaks in the message-ID are passed unmodified to the server, allowing injection of arbitrary NNTP commands; snews: links fail to enforce TLS encryption. This enables command injection and information disclosure from services reachable from the user's network.
Affected products
- Mozilla Thunderbird before 159 and before 153.6
Timeline
- 2026-10-27: disclosed
- 2026-10-27: patched