CVE-2026-91998

Impact

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 products

Versions were read from the advisory text. No structured product data has been published for this record yet.

Weakness classification

References

• NVD record
• CVE.org record
• 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-credential-authorization-bypass-in-apimcp-enables-unrestricted-cross-organization-user-administration
• https://www.vulncheck.com/advisories/casdoor-through-4.4.0-cross-organization-user-administration-via-api-mcp