Dify has a user enumeration issue

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-28288",
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "dateUpdated": "2026-02-27T20:45:44.126Z",
    "dateReserved": "2026-02-26T01:52:58.735Z",
    "datePublished": "2026-02-27T20:25:24.599Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M",
        "dateUpdated": "2026-02-27T20:25:24.599Z"
      },
      "title": "Dify has a user enumeration issue",
      "descriptions": [
        {
          "lang": "en",
          "value": "Dify is an open-source LLM app development platform. Prior to 1.9.0, responses from the Dify API to existing and non-existent accounts differ, allowing an attacker to enumerate email addresses registered with Dify. Version 1.9.0 fixes the issue."
        }
      ],
      "affected": [
        {
          "vendor": "langgenius",
          "product": "dify",
          "versions": [
            {
              "version": "< 1.9.0",
              "status": "affected"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-204: Observable Response Discrepancy",
              "cweId": "CWE-204",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/langgenius/dify/security/advisories/GHSA-9qpf-wcv3-w3qx",
          "name": "https://github.com/langgenius/dify/security/advisories/GHSA-9qpf-wcv3-w3qx",
          "tags": [
            "x_refsource_CONFIRM"
          ]
        },
        {
          "url": "https://github.com/langgenius/dify/issues/24323",
          "name": "https://github.com/langgenius/dify/issues/24323",
          "tags": [
            "x_refsource_MISC"
          ]
        }
      ],
      "metrics": [
        {}
      ]
    },
    "adp": [
      {
        "providerMetadata": {
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP",
          "dateUpdated": "2026-02-27T20:45:44.126Z"
        },
        "title": "CISA ADP Vulnrichment",
        "metrics": [
          {}
        ]
      }
    ]
  }
}