CVE-2026-91998
Casdoor through 4.4.0 Cross-Organization User Administration via /api/mcp
CVSS Score
9.9
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-863 |
| Vendor | casdoor |
| Product | casdoor |
| Published | Sep 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
casdoor / casdoor
0 ≤ 4.4.0
References
github.com: https://github.com/geo-chen/oss/blob/main/casdoor.md#finding-2-application-credential-authorization-bypass-in-apimcp-enables-unrestricted-cross-organization-user-administration github.com: https://github.com/casdoor/casdoor/blob/v4.4.0/authz/authz.go#L174-L176 github.com: https://github.com/casdoor/casdoor/blob/v4.4.0/routers/base.go#L122-L154 github.com: https://github.com/casdoor/casdoor/blob/v4.4.0/mcpself/user.go github.com: https://github.com/casdoor/casdoor vulncheck.com: https://www.vulncheck.com/advisories/casdoor-through-4.4.0-cross-organization-user-administration-via-api-mcp
Credits
🔍 George Chen