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Vulnerability record · CVE-2026-91998 · published 15 September 2026

CVE-2026-91998: Incorrect authorization vulnerability

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.

9.4 CVSS 4.0 Critical EPSS 0.59% · top 53.8% CWE-863 · Incorrect authorization Deferred
9.4CVSS 4.0 base score
0.59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
23 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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-ena
https://www.vulncheck.com/advisories/casdoor-through-4.4.0-cross-organization-user-administration-via-api-mcp

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-91998), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.