CoreWCF up to 1.8.0/1.9.0 WS-Security Signature Verifier authentication replay

Summaryinfo

A vulnerability, which was classified as critical, has been found in CoreWCF up to 1.8.0/1.9.0. Affected by this vulnerability is an unknown functionality of the component WS-Security Signature Verifier. Performing a manipulation results in authentication replay. This vulnerability is identified as CVE-2026-54783. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical has been found in CoreWCF up to 1.8.0/1.9.0. This affects an unknown functionality of the component WS-Security Signature Verifier. The manipulation with an unknown input leads to a authentication replay vulnerability. CWE is classifying the issue as CWE-294. A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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 endorsing and supporting signature verification does not ensure the selected ds:Signature covers the expected Security header target, allowing an attacker with one captured signed SOAP envelope to replay arbitrary service operations as the victim principal. This issue is fixed in versions 1.8.1 and 1.9.1.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-54783 since 06/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1040 according to MITRE ATT&CK.

Upgrading to version 1.8.1 or 1.9.1 eliminates this vulnerability.

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Productinfo

Name

• CoreWCF

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.8.0
• 1.9.0

Website

• Product: https://github.com/CoreWCF/CoreWCF/

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