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Mattermost allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL

🗓️ 14 Nov 2025 09:30:27Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 4 Views

Mattermost vulnerability allows editing arbitrary posts via a crafted Microsoft Teams plugin authorization redirect URL.

Related
Detection
Refs
Vulners
Node
mattermostmattermostRange<8.0.0-20250929212932-a41db04d2746go
OR
mattermostmattermost-serverRange10.12.010.12.1go
OR
mattermostmattermost-serverRange10.5.010.5.12go
OR
mattermostmattermost-serverRange10.11.010.11.4go

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17 Nov 2025 17:58Current
6.8Medium risk
Vulners AI Score6.8
CVSS 3.15.3 - 5.4
EPSS0.00045
SSVC
4