CVE-2026-91998 Casdoor through 4.4.0 Cross-Organization User Administration via /api/mcp
Attackers with valid client credentials can bypass authorization to manage users across all organizations, including creating admins and reading sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-91998?
CVE-2026-91998 is a critical missing authorization vulnerability in casdoor, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-91998?
How do I fix CVE-2026-91998?
No fix has been published for CVE-2026-91998 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-91998 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91998 exists.
Sources
Also known as GHSA-jvmw-g7rg-x26f.