Authentication Bypass Vulnerability in Casdoor by Authing
CVE-2026-9090

9.1CRITICAL

Key Information:

Vendor

Casdoor

Status
Casdoor
Vendor
CVE Published:
28 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-9090?

Casdoor prior to version 2.362.0 is susceptible to an authentication bypass vulnerability. An attacker can exploit this weakness by supplying an arbitrary signing certificate, bypassing the security checks. The flawed buildSpCertificateStore function retrieves the X.509 certificate directly from the incoming SAMLResponse instead of relying on the pre-configured Identity Provider certificate. This oversight allows attackers to forge assertions signed with keys they control, posing a significant threat to system integrity and security. It is crucial for users to upgrade to the latest version to mitigate this risk.

Affected Version(s)

Casdoor 0 <= 2.362.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-9090
Created by biosGit

References

https://kb.cert.org/vuls/id/780781

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.