PT-2026-25684 · Mattermost · Mattermost

0X7Oda7123

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CVE-2026-2458

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Published

2026-02-13

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Updated

2026-07-30

CVSS v3.1

4.3

Medium

VectorAV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Name of the Vulnerable Software and Affected Versions Mattermost versions 10.11.x through 10.11.10 Mattermost versions 11.2.x through 11.2.2 Mattermost versions 11.3.x through 11.3.0
Description The software does not correctly check team membership when searching for channels. This allows a team member who has been removed to list all public channels within a private team by using the channel search API endpoint /api/channels/search. The issue affects Mattermost versions 10.11.x through 10.11.10, 11.2.x through 11.2.2, and 11.3.x through 11.3.0.
Recommendations Update Mattermost to a version later than 10.11.10. Update Mattermost to a version later than 11.2.2. Update Mattermost to a version later than 11.3.0.

Exploit

Fix

Missing Authorization

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Weakness Enumeration

CWE-862

Related Identifiers

BDU:2026-06571
CVE-2026-2458
GHSA-679F-WMRG-QF57
GO-2026-4729
OPENSUSE-SU-2026:21483-1
SUSE-SU-2026:1135-1

Affected Products

Mattermost