Security Advisory

CVE-2026-3590

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-04-15 11:00:14

Last updated 2026-04-15 14:00:27

Assigner Mattermost

State PUBLISHED

Description

Mattermost versions 10.11.x <= 10.11.12, 11.5.x <= 11.5.0, 11.4.x <= 11.4.2, 11.3.x <= 11.3.2 fail to enforce atomic single-use consumption of guest magic link tokens, which allows an attacker with access to a valid magic link to establish multiple independent authenticated sessions via concurrent requests.. Mattermost Advisory ID: MMSA-2026-00624

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