SEPTEMBER 20, 2026
Live Feed
Back to database
Case File

CVE-2026-54776

MEDIUM · CVSS 4.4 EPSS 0.11% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-07-08 · Last synced 2026-08-07

CyberRota Analysis

AI-Generated

CoreWCF services hosted on Unix Domain Sockets with PosixIdentity client credentials are vulnerable to a bypass of framing-layer identity checks, potentially allowing unauthorized message dispatching. This could lead to unauthorized access or manipulation of service communications. Organizations using affected versions prior to 1.8.1 and 1.9.1 should prioritize upgrading to mitigate this risk.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗ github.com ↗ github.com ↗ github.com ↗ github.com ↗ github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-54776
Severity
MEDIUM
CVSS
4.4
EPSS
0.11%
Windows

Original NVD Description

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, a CoreWCF service hosted on Unix Domain Sockets with PosixIdentity client credentials can accept connections that skip the application/unixposix stream upgrade before dispatching messages, bypassing framing-layer identity checks in UnixPosixIdentitySecurityUpgradeProvider. This issue is fixed in versions 1.8.1 and 1.9.1.