CVE-2026-54774
Last modified
CVE-2026-54774 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. 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. EPSS estimates a 0.15% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| CoreWCF | CoreWCF | >= 1.9.0, < 1.9.1; < 1.8.1 |
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-54774?
How severe is CVE-2026-54774?
How do I fix CVE-2026-54774?
How Strix Helps
- Same Subject, Wrong User: A Cross-Issuer Account Takeover in n8nStrix found an identity-binding bug in n8n's token-exchange flow enabling account takeover.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-54768WPGraphQL provides a GraphQL API for WordPress sites. From 2…6.9
- CVE-2026-54769Langroid is a framework for building large-language-model-po…10
- CVE-2026-5477An integer overflow existed in the wolfCrypt CMAC implementa…7.5
- CVE-2026-54771Langroid is a framework for building large-language-model-po…8.1
- CVE-2026-54772CoreWCF is a port of the service side of Windows Communicati…7.5
- CVE-2026-54773CoreWCF is a port of the service side of Windows Communicati…5.9
- CVE-2026-54775CoreWCF is a port of the service side of Windows Communicati…6.5
- CVE-2026-54776CoreWCF is a port of the service side of Windows Communicati…4.4
- CVE-2026-54777CoreWCF is a port of the service side of Windows Communicati…6.5
- CVE-2026-54778CoreWCF is a port of the service side of Windows Communicati…6.2
- CVE-2026-54779CoreWCF is a port of the service side of Windows Communicati…5.9
- CVE-2026-5478The Everest Forms plugin for WordPress is vulnerable to Arbi…8.1
Are you affected by CVE-2026-54774?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST