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CVE-2026-9597

MEDIUM CVSS: 5.4 Published: 2026-07-13 Modified: 2026-07-13

Description

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4 fail to verify whether a guest account is deactivated before creating a session in the magic-link token login path, which allows a deactivated guest user to obtain a fully functional session via a magic-link token issued prior to deactivation.. Mattermost Advisory ID: MMSA-2026-00681

Affected Platforms

Mattermost Mattermost Server

Weakness Type

CWE-305

References