Vulnerability DatabaseCVE-2026-4055
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CVE-2026-4055
Published:May 21, 2026
Updated:June 11, 2026
Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook run which allows an authenticated team member to create runs in teams where they lack permission via specifying a different team ID in the run creation API request. Mattermost Advisory ID: MMSA-2026-00629
Affected Packages
https://github.com/mattermost/mattermost-plugin-playbooks.git (GITHUB):
Affected version(s) >=v0.1.0 <v2.4.3
Fix Suggestion:
Update to version v2.4.3
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.5.0 <v11.5.2
Fix Suggestion:
Update to version v11.5.2
Related Resources (1)
https://mattermost.com/security-updates
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CVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Incorrect Authorization
CWE-863
EPSS
Base Score:
0.03