CVE-2026-62323

Description

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.

CVSS Vector

References

• https://github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dda9cba9
• https://github.com/cloudreve/cloudreve/releases/tag/4.17.0
• https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp
• https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp