{"id":"CVE-2026-54774","state":"PUBLISHED","title":"CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate","description":"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, SamlSerializer skips final SignatureValue verification when a CoreWCF service validates SAML tokens using a non-X.509 signing token, allowing an attacker to reference a non-X.509 SecurityToken key identifier and bypass assertion signature verification. This issue is fixed in versions 1.8.1 and 1.9.1.","publishedAt":"2026-07-08T22:17:07.314Z","updatedAt":"2026-07-10T03:55:39.135Z","severity":{"score":7.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["CoreWCF CoreWCF"],"affected":[{"vendor":"CoreWCF","product":"CoreWCF","versions":[{"version":">= 1.9.0, < 1.9.1","status":"affected"},{"version":"< 1.8.1","status":"affected"}]}],"references":["https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-rpj7-hr7h-w6p9","https://github.com/CoreWCF/CoreWCF/commit/65d09022749854ba943e376aefb958dec05b00d8","https://github.com/CoreWCF/CoreWCF/commit/b914495ce63c44924664643b60a262e7595081a4","https://github.com/CoreWCF/CoreWCF/commit/e7454132876ecc7e2cf80e541a44376eeb54979b","https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1","https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1"],"weaknesses":["CWE-345","CWE-347"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/54xxx/CVE-2026-54774.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54774","state":"PUBLISHED","datePublished":"2026-07-08T22:17:07.314Z","dateUpdated":"2026-07-10T03:55:39.135Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-15T23:23:57.713Z"},"containers":{"cna":{"title":"CoreWCF: SamlSerializer skips SignatureValue verification when SAML signing token is not an X.509 certificate","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, SamlSerializer skips final SignatureValue verification when a CoreWCF service validates SAML tokens using a non-X.509 signing token, allowing an attacker to reference a non-X.509 SecurityToken key identifier and bypass assertion signature verification. This issue is fixed in versions 1.8.1 and 1.9.1."}],"affected":[{"vendor":"CoreWCF","product":"CoreWCF","versions":[{"version":">= 1.9.0, < 1.9.1","status":"affected"},{"version":"< 1.8.1","status":"affected"}]}],"references":[{"url":"https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-rpj7-hr7h-w6p9","name":"https://github.com/CoreWCF/CoreWCF/security/advisories/GHSA-rpj7-hr7h-w6p9","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/CoreWCF/CoreWCF/commit/65d09022749854ba943e376aefb958dec05b00d8","name":"https://github.com/CoreWCF/CoreWCF/commit/65d09022749854ba943e376aefb958dec05b00d8","tags":["x_refsource_MISC"]},{"url":"https://github.com/CoreWCF/CoreWCF/commit/b914495ce63c44924664643b60a262e7595081a4","name":"https://github.com/CoreWCF/CoreWCF/commit/b914495ce63c44924664643b60a262e7595081a4","tags":["x_refsource_MISC"]},{"url":"https://github.com/CoreWCF/CoreWCF/commit/e7454132876ecc7e2cf80e541a44376eeb54979b","name":"https://github.com/CoreWCF/CoreWCF/commit/e7454132876ecc7e2cf80e541a44376eeb54979b","tags":["x_refsource_MISC"]},{"url":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1","name":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.8.1","tags":["x_refsource_MISC"]},{"url":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1","name":"https://github.com/CoreWCF/CoreWCF/releases/tag/v1.9.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-345","lang":"en","description":"CWE-345: Insufficient Verification of Data Authenticity","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-347","lang":"en","description":"CWE-347: Improper Verification of Cryptographic Signature","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-08T22:17:07.314Z"},"source":{"advisory":"GHSA-rpj7-hr7h-w6p9","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-09T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-54774"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-10T03:55:39.135Z"}}]}}}