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    <link>https://vulnerability.circl.lu</link>
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    <lastBuildDate>Wed, 30 Sep 2026 10:13:48 +0000</lastBuildDate>
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      <title>CVE-2026-81889 — elFinder: SSRF protection bypass via DNS rebinding in the `fsock_get_contents()` fallback</title>
      <link>https://vulnerability.circl.lu/vuln/cve-2026-81889</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Studio-42 elFinder&lt;/p&gt;
&lt;p&gt;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[&amp;#39;ip&amp;#39;], but get_remote_contents() selects fsock_get_contents(), which connects to $arr[&amp;#39;host&amp;#39;] and performs a second DNS resolution. An attacker able to submit a URL upload can use DNS rebinding to have the first resolution return a public address and the connection resolution return a loopback or private address, causing the internal HTTP response body to be stored as an uploaded file and made readable through elFinder. After a successful fetch, get_headers($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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Studio-42 elFinder&lt;/p&gt;
&lt;p&gt;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[&amp;#39;ip&amp;#39;], but get_remote_contents() selects fsock_get_contents(), which connects to $arr[&amp;#39;host&amp;#39;] and performs a second DNS resolution. An attacker able to submit a URL upload can use DNS rebinding to have the first resolution return a public address and the connection resolution return a loopback or private address, causing the internal HTTP response body to be stored as an uploaded file and made readable through elFinder. After a successful fetch, get_headers($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.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://vulnerability.circl.lu/vuln/cve-2026-81889</guid>
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