CVE WatchJul 10, 2026

CVE-2026-54774

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, SamlSerializer skips

CVSS

7.4

High

EPSS

0.1%

KEV

—

Exploit Today

0-100

Published: Jul 8, 2026 · Last modified: Jul 10, 2026 · CWE-345 · CWE-347

EPSS · 30d

0.1%EPSS · 30 days0.1%

2026-07-092026-07-17

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, SamlSerializer skips final SignatureValue verification when a CoreWCF service validates SAML tokens using a non-X.509 signing token, allowing an attacker to reference a non-X.509 SecurityToken key identifier and bypass assertion signature verification. This issue is fixed in versions 1.8.1 and 1.9.1.

Official references

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