CVE-2026-8823
Low · 3.8CVSS
3.8
EPSS
0.3%
Published
Jun 22, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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