🛡️ CVE-2025-11777
🟢 CVSS 3.1 — Low ✅ No Known Exploit CWE-863 NVD
3.1
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to properly validate team membership permissions in the Add Channel Member API which allows users from one team to access user metadata and channel membership information from other teams via the API endpoint

Details

Severity LOW
CVSS Score 3.1
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
CWE CWE-863
Public Exploit ✅ No
Source NVD
Published 2025-11-13
Updated 2026-06-15
Modified 2025-11-17
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/mattermost/mattermost
github.com/mattermost/mattermost-server
github.com/mattermost/mattermost-server/v5
github.com/mattermost/mattermost-server/v6
github.com/mattermost/mattermost/server/v8
github.com/mattermost/mattermost/v5
mattermost-server 10.11.0 10.11.4

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