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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact High

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00306.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
cloudreve cloudreve affected
Version Status Constraints
< 4.17.0 affected —

No data.

No data.

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Vendors Products
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Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-c3jm-gv5r-9wcp Cloudreve WOPI view sessions can write files and WOPI access token secret is ignored
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dda9cba9 cve-icon
https://github.com/cloudreve/cloudreve/releases/tag/4.17.0 cve-icon
https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp cve-icon
History

Fri, 31 Jul 2026 05:45:00 +0000

Type Values Removed Values Added
First Time appeared Cloudreve
Cloudreve cloudreve
Vendors & Products Cloudreve
Cloudreve cloudreve

Fri, 31 Jul 2026 04:15:00 +0000

Type Values Removed Values Added
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.
Title Cloudreve: Unauthorized file write via WOPI view sessions whose access token secret is ignored
Weaknesses CWE-863
References
Metrics cvssV3_1

{'score': 6.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-31T03:43:14.900Z

Reserved: 2026-07-13T19:27:58.315Z

Link: CVE-2026-62323

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-31T05:30:07Z

Weaknesses