What is GHSA-rpj7-hr7h-w6p9?

GHSA-rpj7-hr7h-w6p9 is a security advisory published by GitHub Security Advisories with High severity. CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate

Which CVE IDs does GHSA-rpj7-hr7h-w6p9 cover?

GHSA-rpj7-hr7h-w6p9 covers the following CVE IDs: CVE-2026-54774. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-rpj7-hr7h-w6p9?

GHSA-rpj7-hr7h-w6p9 has a CVSS v3 base score of 7.4, published by GitHub Security Advisories.

Which products are affected by GHSA-rpj7-hr7h-w6p9?

GHSA-rpj7-hr7h-w6p9 affects 2 products, including: nuget/CoreWCF.Primitives:\u003c 1.8.1; nuget/CoreWCF.Primitives:\u003e= 1.9.0, \u003c 1.9.1.

GHSA-rpj7-hr7h-w6p9HighCVSS 7.4

CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate

Vendor

GitHub Security Advisories

Published

June 19, 2026

Last Modified

June 19, 2026

🔗 CVE IDs covered (1)

CVE-2026-54774 →

📋 Description

Impact

When a service is configured to validate SAML tokens using a method other than X.509 certificate signing, the final signature verification is skipped.

Preconditions

The service is configured to authenticate using SAML tokens and an out of band token resolver (commonly the IssuerTokenResolver of IssuedTokenServiceCredential) holds a non-X.509 SecurityToken whose key identifier the attacker can reference in the assertion’s <KeyInfo> - for example a BinarySecretSecurityToken representing the symmetric proof key issued by a WS-Trust symmetric-key holder-of-key STS.

Patches

Fixed in CoreWCF v1.8.1 and v1.9.1

Workarounds

None

🎯 Affected products2

nuget/CoreWCF.Primitives:< 1.8.1
nuget/CoreWCF.Primitives:>= 1.9.0, < 1.9.1