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Mattermost doesn't validate that a username returned during bot registration belongs to a bot account

🗓️ 12 Jun 2026 18:31:59Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 6 Views

Mattermost missing bot username validation allows interception of plugin direct messages.

Related
Detection
Refs
Vulners
Node
OR
mattermostmattermostRange8.0.0-20250731163400-5b955468ea1e8.0.0-20260428151657-c79c3831061ago
mattermostmattermost-serverRange10.11.010.11.15go
mattermostmattermost-serverRange11.5.011.5.4go

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24 Aug 2026 21:39Current
5.2Medium risk
Vulners AI Score5.2
CVSS 3.15.3
EPSS0.0019
SSVC
6