MEDIUM 5.9 NuGet
CoreWCF: SAML token replay protection is inoperative
GHSA-9jr3-rj99-8jq3 · CVE-2026-54779
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Description
Impact
When enabling DetectReplayedTokens, a token can be replayed and will be detected despite it being reused.
Patches
Fixed in CoreWCF v1.8.1 and v1.9.1
Workarounds
Provide your own implementation of ITokenReplayCache with the correct behavior.
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