What is CVE-2026-54776?

CVE-2026-54776 is a medium-severity vulnerability in Corewcf, classified under Missing Authentication for Critical Function. CVSS score: 4.4/10. Published 2026-07-08.

How severe is CVE-2026-54776?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Auth bypass in Corewcf

CVE-2026-54776

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…

Vulnerability class: Broken Authentication

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

Affected products

Corewcf — versions >= 1.9.0, < 1.9.1, < 1.8.1

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-54776?: CVE-2026-54776 is a medium-severity vulnerability in Corewcf, classified under Missing Authentication for Critical Function. CVSS score: 4.4/10. Published 2026-07-08.
How severe is CVE-2026-54776?: Medium severity. CVSS v3 base score is 4.4 out of 10.