CVE-2026-54774

HighCVSS 7.4/10Last 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, 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.

Metrics

CVSS 3.1 7.4/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-345CWE-347

Affected software

VendorProductVersions
CoreWCFCoreWCF>= 1.9.0, < 1.9.1; < 1.8.1

References

Timeline

Published
Jul 8, 2026
Last modified
Jul 10, 2026
NVD status
Deferred

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CVE-2026-54774: High severity, CVSS 7.4 | Vulnix