CVE-2026-91998 Casdoor - Authorization Bypass

Casdoor through 4.4.0 contains an authorization bypass caused by improper access control in the /api/mcp endpoint, letting attackers with any application's clientId and clientSecret gain unrestricted user administration access across all organizations, exploit requires valid clientId and clientSecret from any application.

CVSS base score 9.9 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.59% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authorization Bypass
Impact
Broken Access Control, Information Disclosure, Data Tampering
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-863

Vendor fix

Update to the latest version that fixes the authorization bypass vulnerability.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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