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By crafting a malformed file name for an attachment in a multipart message, an attacker can trick Thunderbird into including a directory listing of /tmp when the message is forwarded or edited as a new message. This vulnerability could allow attackers to disclose sensitive information from the victim's system. This vulnerability is not limited to Linux; similar behavior has been observed on Windows as well. This vulnerability affects Thunderbird < 137.0.2 and Thunderbird < 128.9.2.
Reserved 2025-03-26 | Published 2025-04-15 | Updated 2025-04-15 | Assigner mozillaInformation Disclosure of /tmp directory listing
Dario Weißer
bugzilla.mozilla.org/show_bug.cgi?id=1956379
www.mozilla.org/security/advisories/mfsa2025-26/
www.mozilla.org/security/advisories/mfsa2025-27/
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