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CVE-2026-118176Published

Bypass of remote UNC path restriction in mailbox: URLs

Exact source revision recorded 27 Oct 2026 19:45:55 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

cve-program · CVE-2026-118176

Published

Thunderbird's check that prevents mailbox: URLs from accessing files on remote Windows network shares could be bypassed using extended-length UNC paths. Displaying a specially crafted email could cause Thunderbird to connect to an SMB server chosen by the attacker, disclosing the user's Windows account name and NTLM authentication data, which could be used for offline password cracking or relay attacks. This bug only affects Thunderbird on Windows. Other operating systems are unaffected. This vulnerability was fixed in Thunderbird 159 and Thunderbird 153.6.

Source published
27 Oct 2026 18:16:30 UTC
Source modified
27 Oct 2026 18:27:48 UTC
Observed here
27 Oct 2026 19:45:55 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

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Sources read 30 Oct 20:07 UTC · 272 of 272 readable · 270 fully read · documentation 469/469 current

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