Vulnerability Description
Casdoor through 4.4.0 contains an authorization bypass vulnerability in the /api/mcp endpoint that allows attackers with any application's clientId and clientSecret to gain unrestricted access to user administration across all organizations. Attackers can enumerate user records including password salts and email addresses, create administrator accounts, modify existing users, and delete them in any organization by supplying legitimate credentials from a single application.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/casdoor/casdoor
- https://github.com/casdoor/casdoor/blob/v4.4.0/authz/authz.go#L174-L176
- https://github.com/casdoor/casdoor/blob/v4.4.0/mcpself/user.go
- https://github.com/casdoor/casdoor/blob/v4.4.0/routers/base.go#L122-L154
- https://github.com/geo-chen/oss/blob/main/casdoor.md#finding-2-application-crede
- https://www.vulncheck.com/advisories/casdoor-through-4.4.0-cross-organization-us
FAQ
What is CVE-2026-91998?
CVE-2026-91998 is a vulnerability with a CVSS score of 9.9 (CRITICAL). Casdoor through 4.4.0 contains an authorization bypass vulnerability in the /api/mcp endpoint that allows attackers with any application's clientId and clientSecret to gain unrestricted access to user...
How severe is CVE-2026-91998?
CVE-2026-91998 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-91998?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.