CVE-2026-91998Casdoor through 4.4.0 Cross-Organization User Administration via /api/mcp
Updated under an hour ago ()
Does this affect you?
It affects casdoor. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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
- 9.9 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 24, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
casdoor casdoor casdoor:casdoor (from the name) | through 4.4.0 | CNA record |
References
- https://github.com/geo-chen/oss/blob/main/casdoor.md#finding-2-application-credential-authorization-bypass-in-apimcp-enables-unrestricted-cross-organization-user-administrationthird-party-advisory, exploit
- https://github.com/casdoor/casdoor/blob/v4.4.0/authz/authz.go#L174-L176technical-description
- https://github.com/casdoor/casdoor/blob/v4.4.0/routers/base.go#L122-L154technical-description
- https://github.com/casdoor/casdoor/blob/v4.4.0/mcpself/user.gotechnical-description
- https://github.com/casdoor/casdoorproduct
- https://www.vulncheck.com/advisories/casdoor-through-4.4.0-cross-organization-user-administration-via-api-mcpthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.