Bug 2570532 (CVE-2026-126134) - CVE-2026-126134 thunderbird: Feed subscriptions could leak NTLM credentials on Windows
Summary: CVE-2026-126134 thunderbird: Feed subscriptions could leak NTLM credentials o...
Keywords:
Status: NEW
Alias: CVE-2026-126134
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-11-10 20:05 UTC by OSIDB Bzimport
Modified: 2026-11-11 17:28 UTC (History)
5 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-11-10 20:05:20 UTC 
Thunderbird allowed feed subscriptions to file: URLs that point to a network share. If a user was tricked into subscribing to such a URL, Thunderbird connected to the attacker's server when fetching the feed. Windows then sent the user's NTLM credentials to that server.
This bug only affects Thunderbird on Windows. Other operating systems are unaffected. This vulnerability was fixed in Thunderbird 160.
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