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bdu:2026-13684

2026-09-30T06:53:27.763951+00:00

bdu:2026-13684

fkie_cve-2026-81889

2026-09-30T06:53:27.764020+00:00

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.

GHSA-8x3q-jpjh-qh5c — elFinder: SSRF protection bypass via DNS rebinding in the `fsock_get_contents()` fallback

2026-09-30T06:53:27.764094+00:00

Affected: Packagist: studio-42/elfinder

[poc.zip](https://github.com/user-attachments/files/30352020/poc.zip) ## Summary

elFinder 2.1.69 is vulnerable to a Server-Side Request Forgery (SSRF) protection bypass when PHP cURL is unavailable and URL uploads use the `fsock_get_contents()` fallback.

An attacker who can submit a URL for server-side upload can use an attacker-controlled DNS hostname that initially resolves to an allowed public IP address and subsequently resolves to a loopback or private IP address.

The URL validation checks the first resolved IP, but `fsock_get_contents()` opens the actual connection using the original hostname. This causes a second DNS resolution and allows the connection to reach an address different from the one that was validated.

The response from the internal service is saved as an uploaded file and can be read through elFinder. This makes the demonstrated issue a non-blind SSRF.

The most accurate classification is:

* Vulnerability: SSRF protection bypass * Exploitation technique: DNS rebinding * Root cause: TOCTOU/double DNS resolution without IP pinning

## Affected versions

Confirmed affected:

* elFinder 2.1.69, commit `8f2c3ffafcdd52cf4515f1eec172f4eee44552ad` * the current `master` branch inspected on 24 July 2026

The earliest affected version has not been determined.

## Preconditions

The demonstrated readback path requires:

* PHP without the cURL extension (`curl_exec()` unavailable); * access to the URL upload functionality; * permission to upload a MIME type re…