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CVE-2026-9090

CriticalPublished

Casdoor versions 2.362.0 and earlier contain a vulnerability that allows an attacker to bypass authentication by supplying an arbitrary signing certificate....

Published: May 28, 2026
Updated: May 29, 2026
Assigning CNA: certcc
Evidence observed: Aug 10, 2026

Primary CVSS

9.1/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS probability estimate

0.2%

Low · next 30 days

Percentile: 12.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-9090-pocPoC
PoC for CVE-2026-9090 — Casdoor SAML signature bypass (CWE-347). Reproduction-only; coordinated via CERT/CC VU#780781.
CVE-2026-9090-Modbus-TCP-Write-to-Read-Only-Coils-via-Function-Code-SpoofingPoC
PoC Modbus TCP exploit demonstrating spoofed writes to read-only coils in simulated PLCs, highlighting SCADA/ICS access control flaws.

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