CVE-2026-54780
LowCVSS 3.7Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
Vulnerability in CoreWCF (a port of WCF for .NET Core) versions prior to 1.8.1 and 1.9.1. The WS-Security 1.0 receive pipeline validates the ds:SignedInfo SignatureMethod against the configured SecurityAlgorithmSuite but does not validate each ds:Reference DigestMethod, allowing a sender to use a rejected digest algorithm such as SHA-1 while the message is still accepted.
Risk Assessment
The risk is the potential bypass of cryptographic protections and acceptance of messages with outdated or weak digest algorithms (e.g., SHA-1), which could lead to integrity breaches and man-in-the-middle attacks.
Recommendation
Immediately update CoreWCF to version 1.8.1 or 1.9.1, which contain the fix for this vulnerability.
Original NVD description (English source)
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, the CoreWCF WS-Security 1.0 receive pipeline validates ds:SignedInfo SignatureMethod against the configured SecurityAlgorithmSuite but does not validate each ds:Reference DigestMethod, allowing a sender to use a rejected digest algorithm such as SHA-1 while the message is still accepted. This issue is fixed in versions 1.8.1 and 1.9.1.