Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to restrict role_updated websocket event broadcasts to members of the affected team or channel which allows an authenticated attacker with guest-level access to observe permission scheme change notifications for private teams they are not a member of via the websocket connection.. Mattermost Advisory ID: MMSA-2026-00616
Metrics
Affected Vendors & Products
References
| Link | Providers |
|---|---|
| https://mattermost.com/security-updates |
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History
Fri, 12 Jun 2026 18:45:00 +0000
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| First Time appeared |
Mattermost
Mattermost mattermost |
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| Vendors & Products |
Mattermost
Mattermost mattermost |
Fri, 12 Jun 2026 18:30:00 +0000
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| Metrics |
ssvc
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Fri, 12 Jun 2026 17:15:00 +0000
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| Description | Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to restrict role_updated websocket event broadcasts to members of the affected team or channel which allows an authenticated attacker with guest-level access to observe permission scheme change notifications for private teams they are not a member of via the websocket connection.. Mattermost Advisory ID: MMSA-2026-00616 | |
| Title | Mattermost fails to scope role_updated websocket events to authorized team and channel members | |
| Weaknesses | CWE-200 | |
| References |
| |
| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: Mattermost
Published:
Updated: 2026-06-12T17:19:49.970Z
Reserved: 2026-03-02T12:48:20.745Z
Link: CVE-2026-3433
Updated: 2026-06-12T17:19:46.282Z
Status : Received
Published: 2026-06-12T17:16:22.467
Modified: 2026-06-12T17:16:22.467
Link: CVE-2026-3433
No data.
OpenCVE Enrichment
Updated: 2026-06-12T19:00:21Z