Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to appropriately check for valid namespaces which allows plugin users to create subscriptions to groups that were not whitelisted via creating groups that share the same prefix as a whitelisted group. Mattermost Advisory ID: MMSA-2026-00601
References
| Link | Resource |
|---|---|
| https://mattermost.com/security-updates | Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
29 May 2026, 19:11
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Mattermost mattermost Server
Mattermost |
|
| CPE | cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | |
| References | () https://mattermost.com/security-updates - Vendor Advisory |
18 May 2026, 08:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-18 08:16
Updated : 2026-05-29 19:11
NVD link : CVE-2026-6342
Mitre link : CVE-2026-6342
CVE.ORG link : CVE-2026-6342
JSON object : View
Products Affected
mattermost
- mattermost_server
CWE
CWE-863
Incorrect Authorization