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CVE-2026-8823

LOW CVSS: 3.8 Published: 2026-06-22 Modified: 2026-06-26

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

Affected Platforms

Mattermost Mattermost Server

Weakness Type

CWE-863

References