CVE-2026-54780 LOW

CVE-2026-54780: CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass

Vendor Corewcf
Product CoreWCF
Weakness CWE-327 · Broken crypto
Published July 8, 2026
Last update July 9, 2026
View on NVD All CVEs

CVSS base score

3.7/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality None
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

July 8, 2026 CVE published
July 9, 2026 Record updated