CVE-2026-91998: critical vulnerability in casdoor
Casdoor through 4.4.0 Cross-Organization User Administration via /api/mcp
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
48Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 9.4epss 0.6%
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:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Affected products
casdoor · casdoor⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — casdoor
In the same product, most dangerous first.
References
https://github.com/casdoor/casdoorhttps://github.com/casdoor/casdoor/blob/v4.4.0/authz/authz.go#L174-L176https://github.com/casdoor/casdoor/blob/v4.4.0/mcpself/user.gohttps://github.com/casdoor/casdoor/blob/v4.4.0/routers/base.go#L122-L154https://github.com/geo-chen/oss/blob/main/casdoor.md#finding-2-application-credential-authorization-bypass-in-apimcp-enables-unrestricted-cross-organization-user-administrationhttps://www.vulncheck.com/advisories/casdoor-through-4.4.0-cross-organization-user-administration-via-api-mcp