Vulnerability Monitor

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CVE-2025-3932

It was possible to craft an email that showed a tracking link as an attachment. If the user attempted to open the attachment, Thunderbird automatically accessed the link. The configuration to block remote content did not prevent that. Thunderbird has been fixed to no longer allow access to web pages listed in the X-Mozilla-External-Attachment-URL header of an email. This vulnerability affects Thunderbird < 128.10.1 and Thunderbird < 138.0.1.

Published

2025-05-14T17:15:48.763

Last Modified

2025-06-05T14:26:26.170

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 6.5 (MEDIUM)

Weaknesses

Type: Secondary
CWE-288

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	mozilla	thunderbird	< 128.10.1	Yes
Application	mozilla	thunderbird	< 138.0.1	Yes

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1960412 Permissions Required ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-34/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-35/ Vendor Advisory ([email protected])