CVE-2026-54782 Details
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, CoreWCF SAML 1.1 and SAML 2.0 token validation does not correctly resolve the issuer signing key or require signed tokens when IdentityConfiguration is used with federated bindings, allowing an unauthenticated remote attacker to impersonate any principal the trusted STS could issue. This issue is fixed in versions 1.8.1 and 1.9.1.
An authentication bypass vulnerability has been identified in CoreWCF, specifically in the SAML 1.1 and SAML 2.0 token validation process. This issue allows an unauthenticated remote attacker to impersonate any principal that a trusted Security Token Service (STS) could issue. The vulnerability is present in CoreWCF versions 1.8.0 and 1.9.0, when the service is hosted with federated bindings and the IdentityConfiguration is enabled. Under these conditions, the token validation does not properly verify the issuer's signing key or require signed tokens, leaving the service open to impersonation attacks.
Upgrade to CoreWCF versions 1.8.1 or 1.9.1, both of which include the necessary fix. Instructions for downloading these versions are available on the CoreWCF GitHub releases page.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 8, 2026CISA-ADP
Assessed Jul 9, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/CoreWCF/CoreWCF/commit/0b8c8af851260e85e8402af53233d1b8f87dfb6f | [email protected] | Source CodeVendor |
| https://github.com/CoreWCF/CoreWCF/commit/0e63c2cca55763d8be6b226a234579280a09e7b6 | [email protected] | Source CodeVendor |
| https://github.com/CoreWCF/CoreWCF/commit/e5cc9b6a4ecc102a50d782093bfc72e0790abe3d | [email protected] | Source CodeVendor |
| https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1 | [email protected] | Release NotesVendor |
| https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1 | [email protected] | Release NotesVendor |
| https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-xjr9-gg9q-jx3v | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-290 | Authentication Bypass by Spoofing | [email protected] |
| CWE-347 | Improper Verification of Cryptographic Signature | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| CoreWCF | 1.8.0 (semver) 1.9.0 (semver) |
CPE
Remediation
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| CoreWCF.Primitives | All versions |
CPE
Remediation
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| CoreWCF.ConfigurationManager | All versions |
CPE
Remediation
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| CoreWCF.Http | All versions |
CPE
Remediation
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| CoreWCF.Kafka | All versions |
CPE
Remediation
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| CoreWCF.Kafka.Client | All versions |
CPE
Remediation
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| CoreWCF.MSMQ | All versions |
CPE
Remediation
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| CoreWCF.NetFramingBase | All versions |
CPE
Remediation
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| CoreWCF.NetNamedPipe | All versions |
CPE
Remediation
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| CoreWCF.NetTcp | All versions |
CPE
Remediation
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| CoreWCF.Queue | All versions |
CPE
Remediation
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| CoreWCF.RabbitMQ | All versions |
CPE
Remediation
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| CoreWCF.RabbitMQ.Client | All versions |
CPE
Remediation
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| CoreWCF.Templates | All versions |
CPE
Remediation
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| CoreWCF.UnixDomainSocket | All versions |
CPE
Remediation
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| CoreWCF.WebHttp | All versions |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 10, 2026 | CVE Modified | CISA-ADP |
| Jul 9, 2026 | CVE Modified | CISA-ADP |
| Jul 8, 2026 | New CVE Received | [email protected] |