CVE-2026-91998: Casdoor through 4.4.0 Cross-Organization User Administration via /api/mcp
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Casdoorto a version that resolves this vulnerability.Fixed in 4.4.0
Event History
Frequently Asked Questions
What credentials does an attacker need to exploit this issue?
The attacker needs a legitimate clientId and clientSecret from any Casdoor application. Administrator privileges and credentials for the target organization are not required.
Is the impact limited to the organization associated with the compromised application credentials?
No. Valid credentials from a single application can be used to administer users across all organizations, including creating administrator accounts and modifying or deleting users.