CVE-2026-9090 CVE-2026-9090
Attackers can bypass SAML authentication in Casdoor by forging assertions with arbitrary certificates, leading to unauthorized access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-9090?
CVE-2026-9090 is a critical authentication bypass vulnerability in Casdoor, published on 28 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Casdoor versions 2.362.0 and earlier contain a vulnerability that allows an attacker to bypass authentication by supplying an arbitrary signing certificate. The buildSpCertificateStore function extracts the X.509 certificate directly from the incoming SAMLResponse instead of using the trusted pre-configured Identity Provider certificate, allowing an attacker to forge assertions signed with an attacker-controlled key.
Which versions are affected by CVE-2026-9090?
3 open source packages ship an affected version, including github.com/casdoor/casdoor.
| Package | Affected | Fixed in |
|---|---|---|
github.com/casdoor/casdoor Go | All versions | None |
github.com/casdoor/casdoor Go | All versions to 1.1000.1-0.20260321120606-239e8bd69487 | None |
github.com/casdoor/casdoor Go | All versions to 1.1000.1-0.20260321120606-239e8bd69487 | None |
How do I fix CVE-2026-9090?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-9090 being exploited?
There is no known exploitation of CVE-2026-9090 in the wild and no public exploit code.
Public exploit code: 2 proofs of concept on GitHub.
Sources
Also known as GHSA-fwgq-j9r9-qjgr, GO-2026-5895.