Cloudreve up to 4.16.0 OAuth Client client_id behavioral workflow

Summaryinfo

A vulnerability was found in Cloudreve up to 4.16.0 and classified as critical. This impacts an unknown function of the component OAuth Client. The manipulation of the argument client_id results in behavioral workflow. This vulnerability was named CVE-2026-54560. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as critical has been found in Cloudreve up to 4.16.0. Affected is an unknown code of the component OAuth Client. The manipulation of the argument client_id with an unknown input leads to a behavioral workflow vulnerability. CWE is classifying the issue as CWE-841. The product supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor performs the behaviors in the required sequence. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Cloudreve is a self-hosted file management and sharing system. From 4.12.0 until 4.16.1, Cloudreve's OAuth access tokens are issued without the OAuth client_id claim, so the JWT verifier does not load token scopes into request context and RequiredScopes treats the request like non-scoped session authentication, allowing a low-scope OAuth access token to call APIs requiring higher scopes such as file, share, workflow, user setting, WebDAV account, and potentially admin scopes. This issue is fixed in version 4.16.1.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-54560 since 06/15/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit.

Upgrading to version 4.16.1 eliminates this vulnerability.

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Productinfo

Type

• Cloud Software

Name

• Cloudreve

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 4.13
• 4.14
• 4.15
• 4.16.0

Website

• Product: https://github.com/cloudreve/cloudreve/

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