CVE-2026-62323
Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored
- State
- Published
- Severity
- 6.3 Medium
- Published
- Jul 31, 2026
- Updated
- Jul 31, 2026
- Reserved
- Jul 13, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.3 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N | GitHub_M |
Weaknesses
- CWE-863 Incorrect Authorization
Affected Products
| Product | Versions |
|---|---|
cloudrevecloudreve |
|
References
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.