{"id":"CVE-2026-81889","summary":"elFinder: SSRF protection bypass via DNS rebinding in the `fsock_get_contents()` fallback","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.","aliases":["GHSA-8x3q-jpjh-qh5c"],"modified":"2026-09-02T03:47:27.952306596Z","published":"2026-08-31T20:25:27.456Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81889.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-918"]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/studio-42/elfinder","events":[{"introduced":"0"},{"fixed":"191372c1bbebbd36fb55af79a84b9984861390ff"},{"fixed":"6d997386cd0f1abab4706c220b46b0aea0ecff51"},{"fixed":"e7ea668fd569fc9903fb1c431d47d58f2daad2f2"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.1.70"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["2.1.69","2.1.68","2.1.67","2.1.66","2.1.65","2.1.64","2.1.63","2.1.62","2.1.61","2.1.60","2.1.59","2.1.58","2.1.57","2.1.56","2.1.55","2.1.54","2.1.53","2.1.52","2.1.51","2.1.50","2.1.49","2.1.48","2.1.47","2.1.46","2.1.45","2.1.44","2.1.43","2.1.42","2.1.41","2.1.40","2.1.39","2.1.38","2.1.37","2.1.36","2.1.35","2.1.34","2.1.33","2.1.32","2.1.31","2.1.30","2.1.29","2.1.28","2.1.27","2.1.26","2.1.25","2.1.24","2.1.23","2.1.22","2.1.21","2.1.20","2.1.19","2.1.18","2.1.17","2.1.16","2.1.15","2.1.14","2.1.13","2.1.12","2.1.11","2.1.10","2.1.9","2.1.8","2.1.7","2.1.6","2.1.5","2.1.4","2.1.3","2.1.2","2.1.1","2.1.0","2.0-beta","1.0.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81889.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N"}]}