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OpenAdvisories
Medium · 5.9 CVE-2026-54779 EUVD-2026-42463GHSA-9jr3-rj99-8jq3

CoreWCF: SAML token replay protection is inoperative

Published Jul 8, 2026 · Updated Jul 9, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
CoreWCF CoreWCF >= 1.9.0, < 1.9.1, < 1.8.1 —

Affected packages

EcosystemPackageAffectedFixedRecord
NuGet CoreWCF.Primitives < 1.8.1 1.8.1 GHSA-9jr3-rj99-8jq3
NuGet CoreWCF.Primitives >= 1.9.0, < 1.9.1 1.9.1 GHSA-9jr3-rj99-8jq3

References