CVE-2026-62323
Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored
MEDIUM 6.3EPSS 0.3%
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.
- Affected
- cloudreve
- CVSS v3.1 GITHUB
- 6.3 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N - EPSS
- 0.31% chance of exploitation in the next 30 days, 22nd percentile
- Published
- 2026-07-31