{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "zitadel",
          "vendor": "zitadel",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.15.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL\u0027s external identity provider handler checks that the local user\u0027s email is verified but does not verify that the external IdP confirmed ownership of the same email before auto-linking by email, allowing a permissive provider account with a victim email address to be linked to the victim\u0027s local account. This issue is fixed in version 4.15.3."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-287",
              "description": "CWE-287: Improper Authentication",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-10T17:37:37.137Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/zitadel/zitadel/security/advisories/GHSA-992q-9gwp-7r79",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/zitadel/zitadel/security/advisories/GHSA-992q-9gwp-7r79"
        },
        {
          "name": "https://github.com/zitadel/zitadel/commit/c97012f0c5dc2fe960ae6e940cbea23229f0557f",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/zitadel/zitadel/commit/c97012f0c5dc2fe960ae6e940cbea23229f0557f"
        },
        {
          "name": "https://github.com/zitadel/zitadel/releases/tag/v4.15.3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/zitadel/zitadel/releases/tag/v4.15.3"
        }
      ],
      "source": {
        "advisory": "GHSA-992q-9gwp-7r79",
        "discovery": "UNKNOWN"
      },
      "title": "ZITADEL: Auto-linking by email: IdP-side email verification is not checked"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-56666",
    "datePublished": "2026-07-10T17:37:37.137Z",
    "dateReserved": "2026-06-22T16:39:01.043Z",
    "dateUpdated": "2026-07-10T17:37:37.137Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-56666\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-07-10T18:16:24.150\",\"lastModified\":\"2026-07-10T18:56:43.823\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL\u0027s external identity provider handler checks that the local user\u0027s email is verified but does not verify that the external IdP confirmed ownership of the same email before auto-linking by email, allowing a permissive provider account with a victim email address to be linked to the victim\u0027s local account. This issue is fixed in version 4.15.3.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"zitadel\",\"product\":\"zitadel\",\"versions\":[{\"version\":\"\u003c 4.15.3\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N\",\"baseScore\":4.8,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.2,\"impactScore\":2.5}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-287\"}]}],\"references\":[{\"url\":\"https://github.com/zitadel/zitadel/commit/c97012f0c5dc2fe960ae6e940cbea23229f0557f\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/zitadel/zitadel/releases/tag/v4.15.3\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/zitadel/zitadel/security/advisories/GHSA-992q-9gwp-7r79\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}