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CVE-2026-25783

MEDIUM CVSS: 4.3 Published: 2026-03-16 Modified: 2026-06-17

Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly validate User-Agent header tokens which allows an authenticated attacker to cause a request panic via a specially crafted User-Agent header. Mattermost Advisory ID: MMSA-2026-00586

Affected Platforms

Mattermost Mattermost Server

Weakness Type

CWE-1287

References