Mattermost versions 9.10.x <= 9.10.2, 9.11.x <= 9.11.1, 9.5.x <= 9.5.9 fail to sanitize user inputs in the frontend that are used for redirection which allows for a one-click client-side path traversal that is leading to CSRF in Playbooks
Exploitability
AV:NAC:LPR:LUI:RScope
S:UImpact
C:NI:LA:L4.6/CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:LAuthentication