Vulnerability DatabaseCVE-2026-8823
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CVE-2026-8823
Published:June 22, 2026
Updated:August 04, 2026
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
github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.11.0+incompatible <v10.11.18+incompatible
Fix Suggestion:
Update to version v10.11.18+incompatible
Related Resources (3)
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8823.json
https://mattermost.com/security-updates
https://nvd.nist.gov/vuln/detail/CVE-2026-8823
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CVSS v4
Base Score:
5.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
Incorrect Authorization
CWE-863
EPSS
Base Score:
0.32