Medium 5.9Published Jul 8, 2026

CVE-2026-54779CoreWCF: SAML token replay protection is inoperative

Updated under an hour ago (Oct 28, 2026, 5:30 AM ET)

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Exploited in the last 30 days

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: 5.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-294, CWE-613
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 9, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

CoreWCF CoreWCF corewcf:corewcf (from the name)	from 1.9.0, < 1.9.1; before 1.8.1	CNA record

References

References

https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-9jr3-rj99-8jq3	x-refsource-confirm
https://github.com/CoreWCF/CoreWCF/commit/3800c4e2bb4c6fde00ddacefdc2221ef33d55621	x-refsource-misc
https://github.com/CoreWCF/CoreWCF/commit/7b0b5231cf21b4b5c1fc3caac9981f8bee43823f	x-refsource-misc
https://github.com/CoreWCF/CoreWCF/commit/84f8cff5a786b5aaa73448cb379d366a7df98238	x-refsource-misc
https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1	x-refsource-misc
https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.