CVE-2026-54780

LOW 3.7

CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass

CVSS Score

3.7

EPSS Score

0.2%

EPSS Percentile

5th

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.

CWE	CWE-327 CWE-757
Vendor	corewcf
Product	corewcf
Published	Jul 8, 2026
Last Updated	Jul 9, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

CoreWCF / CoreWCF

>= 1.9.0, < 1.9.1 < 1.8.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-4v55-cpmv-3vcm github.com: https://github.com/CoreWCF/CoreWCF/commit/58742312117cc671e6e9c694c2f5f9f669c17136 github.com: https://github.com/CoreWCF/CoreWCF/commit/9104e581cff3d047ace5e179bfae86807a44be1f github.com: https://github.com/CoreWCF/CoreWCF/commit/fea67b2cd73a5a85115c325d504303ec7382e133 github.com: https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1 github.com: https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1