Vulnerability DatabaseCVE-2026-6342
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CVE-2026-6342
Published:May 18, 2026
Updated:June 11, 2026
Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to appropriately check for valid namespaces which allows plugin users to create subscriptions to groups that were not whitelisted via creating groups that share the same prefix as a whitelisted group. Mattermost Advisory ID: MMSA-2026-00601
Affected Packages
https://github.com/mattermost/mattermost-plugin-gitlab.git (GITHUB):
Affected version(s) >=v1.0.0 <v1.12.1
Fix Suggestion:
Update to version v1.12.1
github.com/mattermost/mattermost-plugin-gitlab (GO):
Affected version(s) >=v1.0.0 <v1.12.1
Fix Suggestion:
Update to version v1.12.1
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