---
id: CVE-2026-54780
title: 'CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass'
summary: 'CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass'
severity: low
cvss: 3.7
cwe:
  - CWE-327
  - CWE-757
vendor: CoreWCF
product: CoreWCF.Primitives
ecosystem: nuget
affected:
  - CoreWCF.Primitives < 1.8.1
  - 'CoreWCF.Primitives >= 1.9.0, < 1.9.1'
patched:
  - CoreWCF.Primitives 1.8.1
  - CoreWCF.Primitives 1.9.1
published: '2026-06-19'
updated: '2026-06-19'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-4v55-cpmv-3vcm'
references:
  - url: 'https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-4v55-cpmv-3vcm'
  - url: 'https://github.com/advisories/GHSA-4v55-cpmv-3vcm'
tags:
  - ghsa
  - nuget
ingestedAt: '2026-06-22T13:35:24.426Z'
epss: 0.00237
epssPercentile: 0.1311
---

## Overview

### Impact
CoreWCF’s WS-Security 1.0 receive pipeline validates the `SignatureMethod` of an incoming `ds:SignedInfo` against the configured `SecurityAlgorithmSuite`, but does not validate the `DigestMethod` declared on each `ds:Reference`. As a result, a sender can populate `ds:SignedInfo` with `SignatureMethod` values the suite accepts (for example rsa-sha256 under Basic256Sha256) while declaring a per-reference `DigestMethod` the suite rejects (for example http://www.w3.org/2000/09/xmldsig#sha1). The signature is then verified where it permits SHA-1 digests, and the message is accepted.

### Patches
Fixed in CoreWCF v1.8.1 and v1.9.1

### Workarounds
None

## Affected packages

- `CoreWCF.Primitives < 1.8.1`
- `CoreWCF.Primitives >= 1.9.0, < 1.9.1`

## Remediation

Upgrade to a patched release:

- `CoreWCF.Primitives 1.8.1`
- `CoreWCF.Primitives 1.9.1`