CVE-2026-2458

| EUVD-2026-12409 MEDIUM
2026-03-16 Mattermost GHSA-679f-wmrg-qf57
4.3
CVSS 3.1
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CVSS Vector

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
Analysis Generated
Mar 16, 2026 - 12:00 vuln.today
EUVD ID Assigned
Mar 16, 2026 - 12:00 euvd
EUVD-2026-12409
CVE Published
Mar 16, 2026 - 11:27 nvd
MEDIUM 4.3

Tags

Authentication Bypass Mattermost Suse

Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly validate team membership when searching channels which allows a removed team member to enumerate all public channels within a private team via the channel search API endpoint.. Mattermost Advisory ID: MMSA-2025-00568

Analysis

This vulnerability is an improper access control flaw in Mattermost's channel search functionality that allows removed team members to enumerate all public channels within private teams. Affected versions include Mattermost 11.3.x through 11.3.0, 11.2.x through 11.2.2, and 10.11.x through 10.11.10. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

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Priority Score

22
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +22
POC: 0

Vendor Status

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CVE-2026-2458 vulnerability details – vuln.today
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