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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-62323
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-31 04:17:24 UTC
Updated2026-07-31 20:16:53 UTC
DescriptionCloudreve 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.

Risk And Classification

Primary CVSS: v3.1 6.3 MEDIUM from [email protected]

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

EPSS: 0.003060000 probability, percentile 0.229670000 (date 2026-07-31)

Problem Types: CWE-863 | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N
3.1CNADECLARED6.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cloudreve Cloudreve affected < 4.17.0 Not specified

References

ReferenceSourceLinkTags
github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dd... [email protected] github.com
github.com/cloudreve/cloudreve/releases/tag/4.17.0 [email protected] github.com
github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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