Vulnerability DatabaseCVE-2026-10080
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CVE-2026-10080
Published:August 17, 2026
Updated:September 01, 2026
Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fails to validate WebSocket command field types which allows an authenticated user to crash the plugin process and deny service to all Boards users via a custom_focalboard_SUBSCRIBE_TEAM message with a non-string teamId.. Mattermost Advisory ID: MMSA-2026-00687
Affected Packages
https://github.com/mattermost/mattermost-plugin-boards.git (GITHUB):
Affected version(s) >=v9.0.0 <v9.2.6
Fix Suggestion:
Update to version v9.2.6
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.8.0 <v11.8.4
Fix Suggestion:
Update to version v11.8.4
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.7.0 <v11.7.7
Fix Suggestion:
Update to version v11.7.7
github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.11.0 <v10.11.22
Fix Suggestion:
Update to version v10.11.22
Related Resources (3)
https://mattermost.com/security-updates
https://nvd.nist.gov/vuln/detail/CVE-2026-10080
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/10xxx/CVE-2026-10080.json
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CVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Incorrect Type Conversion or Cast
CWE-704
EPSS
Base Score:
0.30