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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.

PUBLISHED Reserved 2026-06-15 | Published 2026-07-08 | Updated 2026-07-10 | Assigner GitHub_M




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

Problem types

CWE-345: Insufficient Verification of Data Authenticity

CWE-347: Improper Verification of Cryptographic Signature

Product status

>= 1.9.0, < 1.9.1
affected

< 1.8.1
affected

References

github.com/...oreWCF/security/advisories/GHSA-rpj7-hr7h-w6p9

github.com/...ommit/65d09022749854ba943e376aefb958dec05b00d8

github.com/...ommit/b914495ce63c44924664643b60a262e7595081a4

github.com/...ommit/e7454132876ecc7e2cf80e541a44376eeb54979b

github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1

github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1

cve.org (CVE-2026-54774)

nvd.nist.gov (CVE-2026-54774)

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