CVE-2026-8823 — User Manager can demote bot accounts to guest without bot-management permission

CVE-2026-8823

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

Description (CNA)

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 (CNA)

Vendor / product	Versions
Mattermost / Mattermost	affected 11.7.0 through 11.7.0; affected 10.11.0 through 10.11.17; unaffected 11.8.0; unaffected 11.7.1; unaffected 10.11.18

CWE

CWE-863

References

https://mattermost.com/security-updates

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.