{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "15.115.0"
              },
              {
                "introduced": "16.0.0-beta.1"
              },
              {
                "fixed": "16.27.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "introduced": "a2ab8a654ad157cd377242e9481f600e37361049"
            },
            {
              "fixed": "735a41833dfad245cc761ca34fd8944d4ebbb498"
            },
            {
              "fixed": "73decbb00106a12c4e854c98dce8c0e3f42f514e"
            },
            {
              "fixed": "30fe0b4118ff94c95c239dce4bc74ec4ca10a827"
            },
            {
              "fixed": "47a396ec59f5362029feb349eb2b9d10a21afcf8"
            },
            {
              "fixed": "4b32a4e0072e61ce0abcb0d09cfd1f14724fe896"
            }
          ],
          "repo": "https://github.com/frappe/frappe",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-c2xv-c53h-qvr5"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-204"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66002.json"
  },
  "details": "Frappe is a full-stack web application framework. Prior to 15.115.0 and 16.27.0, the public request-data web form and PersonalDataDownloadRequest class in frappe/website/doctype/personal_data_download_request/personal_data_download_request.py return distinguishable response shapes for registered and unregistered email addresses, including the user_name field and persistence behavior. A remote attacker can compare the responses to enumerate registered users. This issue is fixed in versions 15.115.0 and 16.27.0.",
  "id": "CVE-2026-66002",
  "modified": "2026-08-23T03:42:25.107898519Z",
  "published": "2026-08-20T18:29:40.872Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/frappe/frappe/releases/tag/v15.115.0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/frappe/frappe/releases/tag/v16.27.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/66xxx/CVE-2026-66002.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/frappe/frappe/security/advisories/GHSA-c2xv-c53h-qvr5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66002"
    },
    {
      "type": "FIX",
      "url": "https://github.com/frappe/frappe/commit/30fe0b4118ff94c95c239dce4bc74ec4ca10a827"
    },
    {
      "type": "FIX",
      "url": "https://github.com/frappe/frappe/commit/47a396ec59f5362029feb349eb2b9d10a21afcf8"
    },
    {
      "type": "FIX",
      "url": "https://github.com/frappe/frappe/commit/4b32a4e0072e61ce0abcb0d09cfd1f14724fe896"
    },
    {
      "type": "FIX",
      "url": "https://github.com/frappe/frappe/pull/40787"
    },
    {
      "type": "FIX",
      "url": "https://github.com/frappe/frappe/pull/40814"
    },
    {
      "type": "FIX",
      "url": "https://github.com/frappe/frappe/pull/40815"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Frappe: User Enumeration via PDDR"
}