Vulnerability Monitor

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CVE-2025-5986

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 affects Thunderbird < 128.11.1 and Thunderbird < 139.0.2.

Published

2025-06-11T12:15:29.183

Last Modified

2025-11-03T20:19:17.297

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.5 (MEDIUM)

Weaknesses
  • Type: Secondary
    CWE-451
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application mozilla thunderbird < 128.11.1 Yes
Application mozilla thunderbird < 139.0.2 Yes
References