CVE-2026-54781

{"id": "CVE-2026-54781", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54781", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-07-09T14:31:13.261626Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.4, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.2, "exploitabilityScore": 2.2}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "CoreWCF", "product": "CoreWCF", "versions": [{"status": "affected", "version": ">= 1.9.0, < 1.9.1"}, {"status": "affected", "version": "< 1.8.1"}]}]}], "published": "2026-07-08T23:16:55.890", "references": [{"url": "https://github.com/CoreWCF/CoreWCF/commit/6a99df3242f54acd6f89edfd6050430b72d0c685", "source": "security-advisories@github.com"}, {"url": "https://github.com/CoreWCF/CoreWCF/commit/86dd3232b6b8aaf32281be9e8d798afad6145d58", "source": "security-advisories@github.com"}, {"url": "https://github.com/CoreWCF/CoreWCF/commit/9eb9b46d1c2af06fb71f656a02f4d5b4649c1f03", "source": "security-advisories@github.com"}, {"url": "https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1", "source": "security-advisories@github.com"}, {"url": "https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1", "source": "security-advisories@github.com"}, {"url": "https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-48pq-2xq3-c2m4", "source": "security-advisories@github.com"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-287"}, {"lang": "en", "value": "CWE-345"}]}], "descriptions": [{"lang": "en", "value": "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 validation does not enforce SubjectConfirmation method URIs or holder-of-key proof keys in SamlSecurityTokenHandler, allowing holder-of-key downgrade or custom confirmation method assertions to authenticate a subject without proving authority over the assertion. This issue is fixed in versions 1.8.1 and 1.9.1."}], "lastModified": "2026-07-09T16:29:14.203", "sourceIdentifier": "security-advisories@github.com"}