CVE-2025-26696

HIGH

Thunderbird < 128.8.0 and 128.8-128.* and >=136 - Authentication Bypass by Spoofing via OpenPGP Message Type

Title source: llm

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.

References (3)

Core 3

Core References

Issue Tracking

https://bugzilla.mozilla.org/show_bug.cgi?id=1864205

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-17/

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-18/

Scores

CVSS v3 7.0

EPSS 0.0032

EPSS Percentile 23.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-290

Status published

Products (3)

mozilla/thunderbird < 128.8.0

Mozilla/Thunderbird 128.8 - 128.*

Mozilla/Thunderbird 136

Published Mar 10, 2025

Tracked Since Feb 18, 2026