CVE WatchJul 10, 2026

CVE-2026-54782

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

CVSS

10.0

Critical

EPSS

0.2%

p16

KEV

—

Exploit Today

0-100

Published: Jul 8, 2026 · Last modified: Jul 10, 2026 · CWE-290 · CWE-347

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-07-092026-07-19

Technical description

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.

Official references

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