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Mattermost Plugins EUVD-2026-30746

| CVE-2026-6341 MEDIUM
Incorrect Authorization (CWE-863)
2026-05-18 Mattermost GHSA-668g-wr24-468v
Authentication Bypass Mattermost
4.3
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

1
Analysis Generated
May 18, 2026 - 08:17 vuln.today

DescriptionNVD

Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to have API-level checks on which groups the user can create issues or attach comments to which allows a user that is member of multiple groups to create issues to a locked group via direct API requests. Mattermost Advisory ID: MMSA-2026-00602

AnalysisAI

Mattermost Plugins through version 11.5 allow authenticated users to bypass group-level access controls and create issues or attach comments to locked groups they should not access. Attackers holding membership in multiple groups can exploit missing API-level authorization checks via direct API requests to write data into restricted groups, violating intended access boundaries. …

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EUVD-2026-30746 vulnerability details – vuln.today
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