Quick answers
- Is CVE-2026-126132 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-126132 being exploited in the wild.
- How severe is CVE-2026-126132?
- Informational severity, published 10 November 2026.
- Which products and versions are affected?
- Mozilla Thunderbird before 160.
- Is there a fix for CVE-2026-126132?
- Yes: fixed in Thunderbird 160. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-126132 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-126132?
- 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 160
Technical details
When a message was forwarded inline, edited as new, or had an attachment dragged into a compose window, link-type attachments (.desktop on Linux; .url or .lnk on Windows) were resolved to their target content rather than being sent as-is. Upon message save or send, the resolved content replaced the original attachment, disclosing local files or network resources. The vulnerability affects Thunderbird on Linux and Windows only; macOS and other OSes are unaffected.
Affected products
- Mozilla Thunderbird before 160
Timeline
- 2026-11-10: disclosed