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CVE-2026-3433 Mattermost fails to scope role_updated websocket events to authorized team and channel members

🗓️ 12 Jun 2026 15:46:54Reported by MattermostType 
vulnrichment
 vulnrichment
🔗 github.com👁 27 Views

Mattermost role_updated events are not scoped to members, exposing permissions to guest users in private teams.

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12 Jun 2026 15:46Current
5.3Medium risk
Vulners AI Score5.3
CVSS 3.14.3
EPSS0.0018
SSVC
27