CVE-2026-54782

criticalCVSS 10covered by 1 sourcefirst seen 2026-07-08

CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, CoreWCF SAML 1.1 and SAML 2.0 token validation does not correctly resolve the issuer signing key or require signed tokens when IdentityConfiguration is used with federated bindings, allowing an unauthenticated remote attacker to impersonate any principal the trusted STS could issue. This issue is fixed in versions 1.8.1 and 1.9.1.

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Exploitation outlook

Low exploitation risk0.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 16% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalCVE-2026-54782: CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. …nvd · 2026-07-08

External references

NVD record for CVE-2026-54782

CVE.org record

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