CVE-2026-8823
User Manager can demote bot accounts to guest without bot-management permission
CVSS Score
3.8
EPSS Score
0.0%
EPSS Percentile
0th
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
| CWE | CWE-863 |
| Vendor | mattermost |
| Product | mattermost |
| Published | Jun 22, 2026 |
| Last Updated | Jun 22, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low
Affected Versions
Mattermost / Mattermost
11.7.0 ≤ 11.7.0 10.11.0 ≤ 10.11.17
Credits
Edgar Bellot Micó