{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.1.70"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "191372c1bbebbd36fb55af79a84b9984861390ff"
            },
            {
              "fixed": "6d997386cd0f1abab4706c220b46b0aea0ecff51"
            },
            {
              "fixed": "e7ea668fd569fc9903fb1c431d47d58f2daad2f2"
            }
          ],
          "repo": "https://github.com/studio-42/elfinder",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-8x3q-jpjh-qh5c"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81889.json"
  },
  "details": "elFinder is an open-source file manager for web, written in JavaScript using jQuery UI. Prior to 2.1.70, elFinder URL uploads in php/elFinder.class.php can bypass server-side request forgery protections when PHP cURL is unavailable because validate_address() validates $info['ip'], but get_remote_contents() selects fsock_get_contents(), which connects to $arr['host'] and performs a second DNS resolution. An attacker able to submit a URL upload can use DNS rebinding to have the first resolution return a public address and the connection resolution return a loopback or private address, causing the internal HTTP response body to be stored as an uploaded file and made readable through elFinder. After a successful fetch, get_headers($url, true) separately requests the original hostname without reusing the validated and pinned connection, creating an additional blind server-side request forgery path even when curl_get_contents() is selected. This issue is fixed in version 2.1.70.",
  "id": "CVE-2026-81889",
  "modified": "2026-09-02T03:30:28.363639543Z",
  "published": "2026-08-31T20:25:27.456Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Studio-42/elFinder/releases/tag/2.1.70"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81889.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/Studio-42/elFinder/security/advisories/GHSA-8x3q-jpjh-qh5c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-81889"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Studio-42/elFinder/commit/191372c1bbebbd36fb55af79a84b9984861390ff"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Studio-42/elFinder/commit/6d997386cd0f1abab4706c220b46b0aea0ecff51"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "elFinder: SSRF protection bypass via DNS rebinding in the `fsock_get_contents()` fallback"
}