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CVE-2025-5986

MEDIUM

6.5

Description

A crafted HTML email using mailbox:/// links can trigger automatic, unsolicited downloads of .pdf files to the user's desktop or home directory without prompting, even if auto-saving is disabled. This behavior can be abused to fill the disk with garbage data (e.g. using /dev/urandom on Linux) or to leak Windows credentials via SMB links when the email is viewed in HTML mode. While user interaction is required to download the .pdf file, visual obfuscation can conceal the download trigger. Viewing the email in HTML mode is enough to load external content. This vulnerability was fixed in Thunderbird 128.11.1 and Thunderbird 139.0.2.

Details CVE

Score CVSS v3.16.5

SeveriteMEDIUM

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisNONE

Interaction utilisateurREQUIRED

Publie6/11/2025

Derniere modification4/13/2026

Sourcenvd

Observations honeypot0

Produits affectes

mozilla:thunderbird

Faiblesses (CWE)

CWE-451

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1958580%2C1968012(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2025-49/(security@mozilla.org)

https://www.mozilla.org/security/advisories/mfsa2025-50/(security@mozilla.org)

https://lists.debian.org/debian-lts-announce/2025/07/msg00002.html(af854a3a-2127-422b-91ae-364da2661108)

Correlations IOC

Aucune correlation enregistree

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