CVE-2026-54782

—

CVSS 3.1

10.0 critical

EPSS

<1%p35

Published

Jul 8, 2026 (Jul 8, 2026)

Modified

Jul 10, 2026

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.

Weakness: CWE-290, CWE-347
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

NVD CVE.org GitHub PoCs EPSS (0.4%)

In the news0 stories

No ingested article mentions this CVE yet.