CVE-2026-54783CWE-294CWE-345CWE-347

CoreWCF: XML Signature Wrapping in WS-Security endorsing/supporting signature verification allows replay of captured signed messages

High · published July 8, 2026

CVSS v3.1
7.4
EPSS
0%
Percentile
8.5
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, CoreWCF WS-Security endorsing and supporting signature verification does not ensure the selected ds:Signature covers the expected Security header target, allowing an attacker with one captured signed SOAP envelope to replay arbitrary service operations as the victim principal. This issue is fixed in versions 1.8.1 and 1.9.1.

The record
Technical detail
CVSS v3.1
7.4 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00193 · 8.5th percentile
Weaknesses
CWE-294 · Authentication Bypass by Capture-replay; CWE-345 · Insufficient Verification of Data Authenticity; CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-07-08T22:16Z
EPSS history
Timeline
  • 08 JUL 22:16Z
    CoreWCF: XML Signature Wrapping in WS-Security endorsing/supporting signature verification allows replay of captured signed messages
    cvelistv5