CVE-2026-54773
Medium · 5.9CVSS
5.9
EPSS
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Published
Jul 8, 2026
CISA due date
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The record
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 WS-Security signature verification performs a document-wide ds:Signature lookup, allowing an unauthenticated remote attacker to place a SOAP header before wsse:Security and cause WSSecurityOneDotZeroReceiveSecurityHeader to verify an attacker-supplied signature instead of the security header signature. This issue is fixed in versions 1.8.1 and 1.9.1.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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