CVE-2026-55502

Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, POST /api/v4/admin/policy/oauth/signin requires only Admin.Read even though GetOauthRedirectService persists caller-supplied OneDrive secret and app_id values, allowing an OAuth token without Admin.Write to modify storage policy credentials. The route is inside the admin group that requires Admin.Read, but it does not add the local Admin.Write guard used by sibling policy mutation routes. Its handler persists attacker-supplied secret and app_id values into the selected OneDrive storage policy before returning an OAuth URL. This issue is fixed in version 4.17.0.

CVSS v3 7.1 HIGH

7.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/cloudreve/cloudreve/security/advisories/GHSA-hq88-5x99-x3gf
https://github.com/cloudreve/cloudreve/security/advisories/GHSA-hq88-5x99-x3gf

Configurations

No configuration.

History

No history.

Information

Published : 2026-07-31 04:17

Updated : 2026-09-08 20:51

NVD link : CVE-2026-55502

Mitre link : CVE-2026-55502

CVE.ORG link : CVE-2026-55502

JSON object : View

Products Affected

No product.

CWE

CWE-863

Incorrect Authorization

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