Vulnerability · Published May 28, 2026 · Assigned by certcc
CVE-2026-9090CVE-2026-9090
Critical 9.1
In plain English
A critical-severity security flaw in Casdoor from Casdoor. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/casdoor/casdoor | no fix listed | GHSA-fwgq-j9r9-qjgr |
| Go | github.com/casdoor/casdoor | no fix listed | GO-2026-5895 |