CVE-2026-62323
Medium
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.
SeverityMedium
CVSS6.3
Exploit probability—
ProductGithub.com/cloudreve/cloudreve/v4
PublishedJul 31, 2026
First seenJul 31, 2026
Weakness typeCWE-863Incorrect authorization
How to fix
Update
- github.com/cloudreve/Cloudreve/v44.0.0-20260626022433-f3347130ac48 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/cloudreve/Cloudreve/v4Go | v < 4.0.0-20260626022433-f3347130ac48 | 4.0.0-20260626022433-f3347130ac48 |
| github.com/cloudreve/Cloudreve/v3Go | v ≤ 3.0.0-20250225100611-da4e44b77af4, No range specified | — |
| github.com/cloudreve/CloudreveGo | No range specified | — |
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