Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, ViewerSessionValidation uses only the session-id prefix of a WOPI access token and does not enforce the requested viewer action, allowing a malicious or compromised WOPI viewer with a view session to forge the token suffix and invoke WOPI write routes for the underlying file. This issue is fixed in version 4.17.0.
Exploitability
AV:NAC:LPR:LUI:RScope
S:UImpact
C:LI:HA:N6.3/CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:NAccess Control