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Mattermost doesn't escape some variables that could contain malicious content during error page composition

🗓️ 18 May 2026 09:31:47Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 6 Views

Mattermost error page escape flaw in 11.5.x and 10.11.x enables JavaScript injection via config values.

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01 Jun 2026 15:00Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.13.8 - 4.8
EPSS0.00142
SSVC
6