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Vulnerability record · CVE-2026-55502 · published 31 July 2026

CVE-2026-55502: Incorrect authorization vulnerability

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.

7.1 CVSS 3.1 High EPSS 0.34% · top 75.3% CWE-863 · Incorrect authorization Deferred
7.1CVSS 3.1 base score
0.34%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
8 Sep 2026Last modified by NVD

Description

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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-55502), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.