CVE-2026-54780

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, 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.

PUBLISHED Reserved 2026-06-15 | Published 2026-07-08 | Updated 2026-07-09 | Assigner GitHub_M

Problem types

CWE-327: Use of a Broken or Risky Cryptographic Algorithm

CWE-757: Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')

Product status

References

github.com/...oreWCF/security/advisories/GHSA-4v55-cpmv-3vcm

github.com/...ommit/58742312117cc671e6e9c694c2f5f9f669c17136

github.com/...ommit/9104e581cff3d047ace5e179bfae86807a44be1f

github.com/...ommit/fea67b2cd73a5a85115c325d504303ec7382e133

github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1

github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1

cve.org (CVE-2026-54780)

nvd.nist.gov (CVE-2026-54780)

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