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CVE-2026-54774

7.4 · HIGH

CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core.

Published Jul 8, 2026CWE-345EPSS 0.20%

Overview

CVE-2026-54774 is a high-severity vulnerability. It was published on July 8, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/CoreWCF/CoreWCF/commit/65d09022749854ba943e376aefb958dec05b00d8GitHubgithub.com/CoreWCF/CoreWCF/commit/b914495ce63c44924664643b60a262e7595081a4GitHubgithub.com/CoreWCF/CoreWCF/commit/e7454132876ecc7e2cf80e541a44376eeb54979bGitHubgithub.com/CoreWCF/CoreWCF/releases/tag/v1.8.1GitHubgithub.com/CoreWCF/CoreWCF/releases/tag/v1.9.1GitHubgithub.com/CoreWCF/CoreWCF/security/advisories/GHSA-rpj7-hr7h-w6p9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-54774?

CVE-2026-54774 is a high-severity vulnerability. It was published on July 8, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2026-54774?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-54774?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-54774?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-54774 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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