High severity7.4NVD Advisory· Published Jul 8, 2026· Updated Jul 10, 2026
CVE-2026-54774
CVE-2026-54774
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
CoreWCF.PrimitivesNuGet | < 1.8.1 | 1.8.1 |
CoreWCF.PrimitivesNuGet | >= 1.9.0, < 1.9.1 | 1.9.1 |
Affected products
1Patches
Vulnerability mechanics
References
7- github.com/advisories/GHSA-rpj7-hr7h-w6p9ghsaADVISORY
- github.com/CoreWCF/CoreWCF/security/advisories/GHSA-rpj7-hr7h-w6p9nvdWEB
- github.com/CoreWCF/CoreWCF/commit/65d09022749854ba943e376aefb958dec05b00d8nvd
- github.com/CoreWCF/CoreWCF/commit/b914495ce63c44924664643b60a262e7595081a4nvd
- github.com/CoreWCF/CoreWCF/commit/e7454132876ecc7e2cf80e541a44376eeb54979bnvd
- github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1nvd
- github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1nvd
News mentions
1- CoreWCF: 13 CVEs Disclosed in a Single Day — Critical SAML Bypass and WS-Security FlawsVypr Intelligence · Jun 19, 2026