CVE-2026-54560
Cloudreve: OAuth access tokens bypass scope enforcement due to missing client_id claim
HIGH 7.6EPSS 0.5%
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.
- Affected
- cloudreve
- CVSS v3.1 GITHUB
- 7.6 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L - EPSS
- 0.46% chance of exploitation in the next 30 days, 39th percentile
- Published
- 2026-07-15