CVE-2026-62323

Published: Jul 31, 2026Modified: Sep 8, 2026Deferred

6.3

Vector

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

Exploitability: 2.1 / Impact: 4.2

Source: security-advisories@github.com (Secondary)

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.

Related CWEs

CWE-863

Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.

References (4)

https://github.com/cloudreve/cloudreve/commit/f3347130ac48f2ff996af9ef66c97be2dda9cba9

Source: security-advisories@github.com

https://github.com/cloudreve/cloudreve/releases/tag/4.17.0

Source: security-advisories@github.com

https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp

Source: security-advisories@github.com

https://github.com/cloudreve/cloudreve/security/advisories/GHSA-c3jm-gv5r-9wcp

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

No history available yet.