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Mattermost Server CVE-2025-3227

| EUVDEUVD-2025-18758 MEDIUM
Incorrect Authorization (CWE-863)
2025-06-20 responsibledisclosure@mattermost.com GHSA-qwwm-c582-82rx
Authentication Bypass Debian Mattermost Server Suse
4.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
SUSE
MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 15, 2026 - 00:19 euvd
EUVD-2025-18758
Analysis Generated
Mar 15, 2026 - 00:19 vuln.today
CVE Published
Jun 20, 2025 - 15:15 nvd
MEDIUM 4.3

DescriptionCVE.org

Mattermost versions 10.5.x <= 10.5.5, 9.11.x <= 9.11.15, 10.8.x <= 10.8.0, 10.7.x <= 10.7.2, 10.6.x <= 10.6.5 fail to properly enforce channel member management permissions in playbook runs, allowing authenticated users without the 'Manage Channel Members' permission to add or remove users from public and private channels by manipulating playbook run participants when the run is linked to a channel.

Analysis

Mattermost versions 10.5.x <= 10.5.5, 9.11.x <= 9.11.15, 10.8.x <= 10.8.0, 10.7.x <= 10.7.2, 10.6.x <= 10.6.5 fail to properly enforce channel member management permissions in playbook runs, allowing authenticated users without the 'Manage Channel Members' permission to add or remove users from public and private channels by manipulating playbook run participants when the run is linked to a channel.

Technical ContextAI

This vulnerability is classified as Incorrect Authorization (CWE-863).

RemediationAI

Monitor vendor advisories for patches. Apply mitigations such as network segmentation, access restrictions, and monitoring.

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Vendor StatusVendor

Debian

Bug #823556
mattermost-server
Release Status Fixed Version Urgency
open - -

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Server 16.0 Fixed
openSUSE Tumbleweed Fixed

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CVE-2025-3227 vulnerability details – vuln.today
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