Vulnerability 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 Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dd
- 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
FAQ
What is CVE-2026-62323?
CVE-2026-62323 is a vulnerability with a CVSS score of 6.3 (MEDIUM). 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...
How severe is CVE-2026-62323?
CVE-2026-62323 has been rated MEDIUM with a CVSS base score of 6.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-62323?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.