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GO-2026-5360 Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flaw in github.com/mattermost/mattermost-server

🗓️ 25 Jun 2026 18:43:19Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 3 Views

Mattermost server flaw allows account takeover via overly permissive substring matching.

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25 Jun 2026 19:45Current
6Medium risk
Vulners AI Score6
CVSS 3.15.7 - 6.1
EPSS0.0018
SSVC
3