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CVE-2026-54779mediumCWE-294CWE-613

CoreWCF: SAML token replay protection is inoperative

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 5.9epss 0.3%
exploitation probability
0.3%top 81% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected products
CoreWCF · CoreWCF
References
https://github.com/CoreWCF/CoreWCF/commit/3800c4e2bb4c6fde00ddacefdc2221ef33d55621https://github.com/CoreWCF/CoreWCF/commit/7b0b5231cf21b4b5c1fc3caac9981f8bee43823fhttps://github.com/CoreWCF/CoreWCF/commit/84f8cff5a786b5aaa73448cb379d366a7df98238https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-9jr3-rj99-8jq3