Mattermost versions 10.5.x <= 10.5.1, 10.4.x <= 10.4.3, 9.11.x <= 9.11.9 fail to check the "Allow Users to View Archived Channels" configuration when fetching channel metadata of a post from archived channels, which allows authenticated users to access such information when a channel is archived.
Advisories
Source ID Title
EUVD EUVD EUVD-2025-11358 Mattermost Incorrect Authorization vulnerability
Github GHSA Github GHSA GHSA-h4rr-f37j-4hh7 Mattermost Incorrect Authorization vulnerability
Fixes

Solution

Update Mattermost to versions 10.6.0, 10.5.2, 10.4.4, 9.11.10 or higher.


Workaround

No workaround given by the vendor.

References
History

Wed, 01 Oct 2025 18:30:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Vendors & Products Mattermost mattermost Server

Wed, 16 Apr 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 16 Apr 2025 08:00:00 +0000

Type Values Removed Values Added
Description Mattermost versions 10.5.x <= 10.5.1, 10.4.x <= 10.4.3, 9.11.x <= 9.11.9 fail to check the "Allow Users to View Archived Channels" configuration when fetching channel metadata of a post from archived channels, which allows authenticated users to access such information when a channel is archived.
Title Channel metadata visible in archived channels despite configuration setting
Weaknesses CWE-863
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2025-04-16T14:34:19.313Z

Reserved: 2025-04-08T07:50:19.660Z

Link: CVE-2025-27571

cve-icon Vulnrichment

Updated: 2025-04-16T14:22:56.742Z

cve-icon NVD

Status : Analyzed

Published: 2025-04-16T08:15:14.353

Modified: 2025-10-01T18:20:18.890

Link: CVE-2025-27571

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-07-13T11:07:01Z