Security Advisory

CVE-2026-8823

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-22 13:41:28

Last updated 2026-06-22 16:12:31

Assigner Mattermost

CVSS score 3.8

State PUBLISHED

Description

Mattermost versions 11.7.x <= 11.7.0, 10.11.x <= 10.11.17 fail to validate bot targets when demoting users to guests which allows a lower-privileged administrator to degrade arbitrary bot accounts via the standard demote-user API.. Mattermost Advisory ID: MMSA-2026-00669

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