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CVE-2026-126134

Feed subscriptions could leak NTLM credentials on Windows

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-126134

Published

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 and Thunderbird 153.7.

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Affected versions, risk and source history

Exploitation and risk

Source status

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Risk history

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Advisory history

2 saved versions

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10 Nov 2026 22:21:22 UTC

Feed subscriptions could leak NTLM credentials on Windows

cve-program · CVE-2026-126134 · Published

10 Nov 2026 21:21:24 UTC

Feed subscriptions could leak NTLM credentials on Windows

cve-program · CVE-2026-126134 · Published

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 15 Nov 20:10 UTC · 254 of 275 readable · 250 fully read · documentation 468/469 current

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