CVE-2026-2458 — Unauthorized channel enumeration in private teams after member removal
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 …
Published: 2026-03-16 · CVSS: 4.3 · CVSS 3.1
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
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7