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CVE-2026-62323
Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored
Medium6.3EPSS 0.31%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium6.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N |
| NVDNVD · Deferred | 3.1 | Medium6.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.31% · top 76% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.3.
Weakness
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Gogithub.com/cloudreve/Cloudreve/v3GHSA-c3jm-gv5r-9wcp (opens in a new tab)
- Gogithub.com/cloudreve/Cloudreve/v4GHSA-c3jm-gv5r-9wcp (opens in a new tab)
References (3)
- https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp (opens in a new tab)x_refsource_CONFIRMexploit
- https://github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dda9cba9 (opens in a new tab)x_refsource_MISC
- https://github.com/cloudreve/cloudreve/releases/tag/4.17.0 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-c3jm-gv5r-9wcp (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-62323)Record last updated .