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Mattermost allows attackers to spoof permalink embeds

🗓️ 16 Mar 2026 15:30:42Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 5 Views

Mattermost versions sanitize post metadata improperly, enabling authenticated users to spoof permalink embeds.

Related
Detection
Refs
Vulners
Node
mattermostmattermost-serverRange11.3.0-rc111.3.1go
OR
mattermostmattermost-serverRange11.2.0-rc111.2.3go
OR
mattermostmattermost-serverRange10.11.0-rc110.11.11go
OR
mattermostmattermost-serverRange<5.3.2-0.20260123211116-9efe617be8b8go
OR
mattermostmattermostRange<8.0.0-20260123211116-9efe617be8b8go

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17 Mar 2026 20:00Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.14.3
EPSS0.00023
SSVC
5