CVE-2026-8823

User Manager can demote bot accounts to guest without bot-management permission

State: Published
Severity: 3.8 Low
Published: Jun 22, 2026
Updated: Jun 22, 2026
Reserved: May 18, 2026

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

Scores

CVSS	Score	Vector	Source
3.1	3.8 Low	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L	Mattermost

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
MattermostMattermost	11.7.0 through 11.7.0Affected 10.11.0 through 10.11.17Affected 11.8.0Not affected 11.7.1Not affected 10.11.18Not affected

References

MMSA-2026-00669vendor-advisory

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