CVE-2026-62323

MEDIUM 6.3

Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored

CVSS Score

6.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-863
Vendor	cloudreve
Product	cloudreve
Published	Jul 31, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

None

Affected Versions

cloudreve / cloudreve

< 4.17.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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