CVE-2026-62323
MEDIUMCloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp
X_Refsource_Misc x_refsource_misc
https://github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dda9cba9
X_Refsource_Misc x_refsource_misc
https://github.com/cloudreve/cloudreve/releases/tag/4.17.0
Scores
CVSS v3
6.3
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N
Details
CWE
CWE-863
Status
published
Products (1)
cloudreve/cloudreve
< 4.17.0
Published
Jul 31, 2026
Tracked Since
Jul 31, 2026