CVE-2026-54779

MEDIUM 5.9

CoreWCF: SAML token replay protection is inoperative

CVSS Score

5.9

EPSS Score

0.3%

EPSS Percentile

18th

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.

CWE	CWE-294 CWE-613
Vendor	corewcf
Product	corewcf
Published	Jul 8, 2026
Last Updated	Jul 9, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

CoreWCF / CoreWCF

>= 1.9.0, < 1.9.1 < 1.8.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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