Improper Verification of Cryptographic Signature Affecting corewcf.primitives package, versions [,1.8.1)[1.9.0,1.9.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DOTNET-COREWCFPRIMITIVES-17398198
- published22 Jun 2026
- disclosed19 Jun 2026
- creditUnknown
Introduced: 19 Jun 2026
NewCVE-2026-54783 (opens in a new tab)How to fix?
Upgrade CoreWCF.Primitives to version 1.8.1, 1.9.1 or higher.
Overview
CoreWCF.Primitives is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. The goal of this project is to enable existing WCF services to move to .NET Core.
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature in the WS-Security signature verification process. An attacker can impersonate a victim and invoke arbitrary operations by replaying captured signed SOAP messages with a fresh timestamp. This is only exploitable if an attacker is able to capture a signed SOAP envelope in transit.
Workaround
This vulnerability can be mitigated by ensuring communication is protected by SSL/TLS to prevent the capture of signed SOAP envelopes.