CVE-2026-54776

mediumCVSS 4.4covered by 1 sourcefirst seen 2026-07-08

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.

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Exploitation outlook

Low exploitation risk0.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-54776: CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. …nvd · 2026-07-08

External references

NVD record for CVE-2026-54776

CVE.org record

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