Vulnerability DatabaseCVE-2026-10542
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CVE-2026-10542
Published:September 14, 2026
Updated:September 22, 2026
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to validate channel action ownership which allows channel managers to update actions in other channels via the channel action update endpoint.. Mattermost Advisory ID: MMSA-2026-00692
Affected Packages
https://github.com/mattermost/mattermost-plugin-playbooks.git (GITHUB):
Affected version(s) >=client/v0.0.1 <v2.10.1
Fix Suggestion:
Update to version v2.10.1
Related Resources (2)
https://mattermost.com/security-updates
https://nvd.nist.gov/vuln/detail/CVE-2026-10542
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CVSS v4
Base Score:
2.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Weakness Type (CWE)
Authorization Bypass Through User-Controlled Key
CWE-639
EPSS
Base Score:
0.13