CVE-2026-54560

Cloudreve: OAuth access tokens bypass scope enforcement due to missing client_id claim

Published Jul 15, 2026 CVSS 3.1 · 7.6 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-vgj4-345g-jcf8 Cloudreve: OAuth access tokens bypass scope enforcement due to missing client_id claim
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Cloudreve
Cloudreve cloudreve
Vendors & Products Cloudreve
Cloudreve cloudreve
Type Values Removed Values Added
Description 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.
Title Cloudreve: OAuth access tokens bypass scope enforcement due to missing client_id claim
Weaknesses CWE-863
References
Metrics cvssV3_1

{'score': 7.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 15, 2026, 3:16 PM
Reserved
Jun 15, 2026, 7:04 PM
Status
Deferred
Published
Jul 15, 2026, 3:16 PM
Modified
Jul 15, 2026, 6:15 PM