Auth bypass in Cloudreve
CVE-2026-54560
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.
Vulnerability class: Broken Access Control
EPSS: 0.005 (38.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L.
Affected products
- Cloudreve — versions >= 4.12.0, < 4.16.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-54560?
- CVE-2026-54560 is a high-severity vulnerability in Cloudreve, classified under Incorrect Authorization. CVSS score: 7.6/10. Published 2026-07-15.
- How severe is CVE-2026-54560?
- High severity. CVSS v3 base score is 7.6 out of 10.