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Mattermost doesn't enforce slash command trigger-word uniqueness during command updates

🗓️ 18 May 2026 09:31:48Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 9 Views

Mattermost does not enforce slash command trigger-word uniqueness on updates, enabling hijacking.

Related
Detection
Refs
Vulners
Node
mattermostmattermost-serverRange<5.3.2-0.20260306123948-f5fe8ded6b63go
OR
mattermostmattermostRange<8.0.0-20260306123948-f5fe8ded6b63go
OR
mattermostmattermostRange11.4.011.4.4go
OR
mattermostmattermostRange10.11.010.11.14go
OR
mattermostmattermostRange11.5.011.5.2go

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01 Jun 2026 15:13Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.14.3
EPSS0.00152
SSVC
9