VULNERABILITY INTELLIGENCE
CVE-2026-54782
CVSS score10 CRITICAL
EPSS probability0.41%
CISA KEVNot currently listed
Published2026-07-08
Last modified2026-07-10
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
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 classification
- security-advisories@github.com: CWE-290