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
Metrics
Affected Vendors & Products
References
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
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History
Mon, 18 May 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Mon, 18 May 2026 10:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Mattermost
Mattermost mattermost |
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| Vendors & Products |
Mattermost
Mattermost mattermost |
Mon, 18 May 2026 08:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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 | |
| Title | Group prefix matching bypass for subscriptions | |
| Weaknesses | CWE-863 | |
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: Mattermost
Published:
Updated: 2026-05-18T14:32:56.965Z
Reserved: 2026-04-15T10:38:08.317Z
Link: CVE-2026-6342
Updated: 2026-05-18T14:32:52.525Z
Status : Undergoing Analysis
Published: 2026-05-18T08:16:14.717
Modified: 2026-05-18T17:32:38.127
Link: CVE-2026-6342
No data.
OpenCVE Enrichment
Updated: 2026-05-18T10:00:12Z