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EUVD-2026-276721

2026-10-18T06:11:03.798190+00:00

EUVD-2026-276721

fkie_cve-2026-32812

2026-10-18T06:11:03.798229+00:00

Admidio is an open-source user management solution. In versions 5.0.0 through 5.0.6, unrestricted URL fetch in the SSO Metadata API can result in SSRF and local file reads. The SSO Metadata fetch endpoint at modules/sso/fetch_metadata.php accepts an arbitrary URL via $_GET['url'], validates it only with PHP's FILTER_VALIDATE_URL, and passes it directly to file_get_contents(). FILTER_VALIDATE_URL accepts file://, http://, ftp://, data://, and php:// scheme URIs. An authenticated administrator can use this endpoint to read arbitrary local files via the file:// wrapper (Local File Read), reach internal services via http:// (SSRF), or fetch cloud instance metadata. The full response body is returned verbatim to the caller. This issue has been fixed in version 5.0.7.

GHSA-6j68-gcc3-mq73 — Admidio Vulnerable to SSRF and Local File Read via Unrestricted URL Fetch in SSO Metadata Endpoint

2026-10-18T06:11:03.798267+00:00

Affected: Packagist: admidio/admidio

## Summary

The SSO metadata fetch endpoint at `modules/sso/fetch_metadata.php` accepts an arbitrary URL via `$_GET['url']`, validates it only with PHP's `FILTER_VALIDATE_URL`, and passes it directly to `file_get_contents()`. `FILTER_VALIDATE_URL` accepts `file://`, `http://`, `ftp://`, `data://`, and `php://` scheme URIs. An authenticated administrator can use this endpoint to read arbitrary local files via the `file://` wrapper (Local File Read), reach internal services via `http://` (SSRF), or fetch cloud instance metadata. The full response body is returned verbatim to the caller.

## Details

### Vulnerable Code

File: `D:/bugcrowd/admidio/repo/modules/sso/fetch_metadata.php`, lines 9-34

```php $url = filter_var($_GET['url'], FILTER_VALIDATE_URL); if (!$url) { http_response_code(400); echo "Invalid URL"; exit; }

// Fetch metadata from external server $metadata = file_get_contents($url); if ($metadata === false) { http_response_code(500); echo "Failed to fetch metadata"; exit; }

echo $metadata; ```

### FILTER_VALIDATE_URL Does Not Block Dangerous Schemes

PHP's `FILTER_VALIDATE_URL` is a format validator, not a security allowlist. It accepts any syntactically valid URL regardless of scheme or destination. The following schemes all pass validation and are handled by `file_get_contents()`:

| Scheme | Impact | |--------|--------| | `file:///etc/passwd` | Read any local file the web server process can access | | `http://127.0.0.1/` | SSRF to loca…