CVE-2026-54774

HIGH 7.4

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

CVSS Score

7.4

EPSS Score

0.1%

EPSS Percentile

5th

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.

CWE	CWE-345 CWE-347
Vendor	corewcf
Product	corewcf
Published	Jul 8, 2026
Last Updated	Jul 10, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

CoreWCF / CoreWCF

>= 1.9.0, < 1.9.1 < 1.8.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-rpj7-hr7h-w6p9 github.com: https://github.com/CoreWCF/CoreWCF/commit/65d09022749854ba943e376aefb958dec05b00d8 github.com: https://github.com/CoreWCF/CoreWCF/commit/b914495ce63c44924664643b60a262e7595081a4 github.com: https://github.com/CoreWCF/CoreWCF/commit/e7454132876ecc7e2cf80e541a44376eeb54979b github.com: https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1 github.com: https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1