CVE-2025-26696

Crafted email message incorrectly shown as being encrypted

State: Published
Severity: 7.0 High
Published: Mar 10, 2025
Updated: Apr 13, 2026
Reserved: Feb 13, 2025

Description

Certain crafted MIME email messages that claimed to contain an encrypted OpenPGP message, which instead contained an OpenPGP signed message, were wrongly shown as being encrypted. This vulnerability was fixed in Thunderbird 136 and Thunderbird 128.8.

Scores

CVSS	Score	Vector	Source
3.1	7.0 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L	CISA-ADP

Weaknesses

CWE-290 Authentication Bypass by Spoofing

Affected Products

Product	Versions
ThunderbirdMozilla	128.8 through 128.*Not affected 136 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1864205
https://www.mozilla.org/security/advisories/mfsa2025-17/
https://www.mozilla.org/security/advisories/mfsa2025-18/

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