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    CVE-2026-54783

    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.

    Published:Jul 8, 2026
    Last Modified:Jul 9, 2026
    EPS:Jul 8, 2026
    EPSS Score:0.00143
    CVSS Score:7.4

    Affected Products

    Vendor
    Corewcf
    Product
    Corewcf

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-102 Session Sidejacking
    CAPEC-111 JSON Hijacking (aka JavaScript Hijacking)
    CAPEC-141 Cache Poisoning
    CAPEC-142 DNS Cache Poisoning
    CAPEC-148 Content Spoofing
    CAPEC-218 Spoofing of UDDI/ebXML Messages
    CAPEC-384 Application API Message Manipulation via Man-in-the-Middle
    CAPEC-385 Transaction or Event Tampering via Application API Manipulation
    CAPEC-386 Application API Navigation Remapping
    CAPEC-387 Navigation Remapping To Propagate Malicious Content
    CAPEC-388 Application API Button Hijacking
    CAPEC-463 Padding Oracle Crypto Attack
    CAPEC-475 Signature Spoofing by Improper Validation
    CAPEC-509 Kerberoasting
    CAPEC-555 Remote Services with Stolen Credentials
    CAPEC-561 Windows Admin Shares with Stolen Credentials
    CAPEC-60 Reusing Session IDs (aka Session Replay)
    CAPEC-644 Use of Captured Hashes (Pass The Hash)
    CAPEC-645 Use of Captured Tickets (Pass The Ticket)
    CAPEC-652 Use of Known Kerberos Credentials
    CAPEC-665 Exploitation of Thunderbolt Protection Flaws
    CAPEC-701 Browser in the Middle (BiTM)
    CAPEC-94 Adversary in the Middle (AiTM)

    Related CVEs

    CVE-2026-54782 (CVSS 10) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54781 (CVSS 7.4) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54784 (CVSS 7.4) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. In version 1.9.0…
    CVE-2026-54774 (CVSS 7.4) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54780 (CVSS 3.7) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54775 (CVSS 6.5) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54778 (CVSS 6.2) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54773 (CVSS 5.9) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54779 (CVSS 5.9) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…
    CVE-2026-54772 (CVSS 7.5) — CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 a…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High