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.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-rpj7-hr7h-w6p9 CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate
Fixes

Solution

No solution given by the vendor.


Workaround

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History

Thu, 09 Jul 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 08 Jul 2026 23:45:00 +0000

Type Values Removed Values Added
First Time appeared Corewcf
Corewcf corewcf
Vendors & Products Corewcf
Corewcf corewcf

Wed, 08 Jul 2026 22:30:00 +0000

Type Values Removed Values Added
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.
Title CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate
Weaknesses CWE-345
CWE-347
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-09T14:40:18.629Z

Reserved: 2026-06-15T23:23:57.713Z

Link: CVE-2026-54774

cve-icon Vulnrichment

Updated: 2026-07-09T14:31:15.364Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-09T09:15:05Z

Weaknesses