Medium 6.3Published Jul 30, 2026

CVE-2026-62323Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored

Updated under an hour ago (Oct 26, 2026, 5:30 PM ET)

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Exploited in the last 30 days

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: 6.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N
Weakness (CWE): CWE-863
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 31, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

cloudreve cloudreve cloudreve:cloudreve (from the name)	before 4.17.0	CNA record

References

References

https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp	x-refsource-confirm
https://github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dda9cba9	x-refsource-misc
https://github.com/cloudreve/cloudreve/releases/tag/4.17.0	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.