CVE-2026-91998

Casdoor through 4.4.0 Cross-Organization User Administration via /api/mcp

Published Sep 15, 2026 CVSS 4.0 · 9.4 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Casdoor
Casdoor casdoor
Vendors & Products Casdoor
Casdoor casdoor
Type Values Removed Values Added
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.
Title Casdoor through 4.4.0 Cross-Organization User Administration via /api/mcp
First Time appeared Casbin
Casbin casdoor
Weaknesses CWE-863
CPEs cpe:2.3:a:casbin:casdoor:*:*:*:*:*:*:*:*
Vendors & Products Casbin
Casbin casdoor
References
Metrics cvssV3_1

{'score': 9.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.4, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Sep 24, 2026, 2:22 PM
Reserved
Sep 15, 2026, 11:11 AM
Status
Deferred
Published
Sep 15, 2026, 12:17 PM
Modified
Sep 23, 2026, 5:17 PM