Security Advisory

CVE-2026-6046

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-12 15:52:33

Last updated 2026-06-12 17:18:30

Assigner Mattermost

CVSS score 5.3

State PUBLISHED

Description

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to validate that a username returned during bot registration belongs to a bot account, which allows an unprivileged attacker to intercept private messages sent by plugins via direct message channels by pre-registering a user account with a predictable plugin bot username.. Mattermost Advisory ID: MMSA-2026-00649

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