admidio up to 5.0.6 SSO Metadata API fetch_metadata.php file_get_contents url server-side request forgery

Summaryinfo

A vulnerability categorized as critical has been discovered in admidio up to 5.0.6. The affected element is the function file_get_contents of the file modules/sso/fetch_metadata.php of the component SSO Metadata API. The manipulation of the argument url results in server-side request forgery. This vulnerability is identified as CVE-2026-32812. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in admidio up to 5.0.6. Affected is the function file_get_contents of the file modules/sso/fetch_metadata.php of the component SSO Metadata API. The manipulation of the argument url with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-32812 since 03/16/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation needs additional levels of successful authentication. Technical details are known, but there is no available exploit.

By approaching the search of inurl:modules/sso/fetch_metadata.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 5.0.7 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch f6b7a966abe4d75e9f707d665d7b4b5570e3185a is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

• admidio

Version

• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.0.6

License

• open-source

Website

• Product: https://github.com/Admidio/admidio/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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