CVE-2026-54780CWE-327CWE-757

CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass

Low · published July 8, 2026

CVSS v3.1
3.7
EPSS
0%
Percentile
13.9
In the wild
Unconfirmed
What it 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, 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.

The record
Technical detail
CVSS v3.1
3.7 · LOW
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00237 · 13.9th percentile
Weaknesses
CWE-327 · Use of a Broken or Risky Cryptographic Algorithm; CWE-757 · Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Published
2026-07-08T22:15Z
EPSS history
Timeline
  • 08 JUL 22:15Z
    CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass
    cvelistv5