Cyber Resilience

CVE-2026-9090

CriticalUpdated

Published: 28 May 2026

Published
28 May 2026
Modified
17 June 2026
KEV Added
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Patch
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CVSS Score v3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS Score 0.0020 10.2th percentile
Risk Priority 70 floored blend · peak EPSS

Summary

CVE-2026-9090 is a critical-severity an unspecified weakness vulnerability. Its CVSS base score is 9.1 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 10.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

more

Provider certificate, allowing an attacker to forge assertions signed with an attacker-controlled key.

CWE(s)
None listed

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1606.002 SAML Tokens Credential Access
An adversary may forge SAML tokens with any permissions claims and lifetimes if they possess a valid SAML token-signing certificate.
attack.mitre.org →
Why these techniques?

SAML assertion forgery via untrusted certificate extraction directly enables T1606.002 (Forge SAML Tokens) and exploitation of the exposed Casdoor service (T1190).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

Affected Assets

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Casdoor
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References