CVE WatchJul 9, 2026

CVE-2026-54779

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 SAML token r

CVSS

5.9

Medium

EPSS

0.3%

p19

KEV

—

Exploit Today

0-100

Published: Jul 8, 2026 · Last modified: Jul 9, 2026 · CWE-294 · CWE-613

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-07-092026-07-21

Technical 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, CoreWCF SAML token replay protection is inoperative because DefaultTokenReplayCache.TryAdd does not reject duplicate tokens when DetectReplayedTokens is enabled, allowing a captured token to be reused. This issue is fixed in versions 1.8.1 and 1.9.1.

Official references

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