Koel up to 9.6.x Subsonic API RadioStreamProxy.php openStream streamUrl server-side request forgery

Summaryinfo

A vulnerability was found in Koel up to 9.6.x and classified as problematic. This vulnerability affects the function RadioStreamProxy::openStream of the file app/Services/Radio/RadioStreamProxy.php of the component Subsonic API. Executing a manipulation of the argument streamUrl can lead to server-side request forgery. This vulnerability appears as CVE-2026-54493. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic was found in Koel up to 9.6.x. This vulnerability affects the function RadioStreamProxy::openStream of the file app/Services/Radio/RadioStreamProxy.php of the component Subsonic API. The manipulation of the argument streamUrl with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality. CVE summarizes:

Koel is a free, open-source music streaming solution. Prior to 9.7.0, the Subsonic-compatible createInternetRadioStation.view and updateInternetRadioStation.view routes accept an authenticated user's streamUrl without the SafeUrl and HasAudioContentType checks used by the regular radio API. app/Http/Requests/Subsonic/CreateInternetRadioStationRequest.php and app/Http/Requests/Subsonic/UpdateInternetRadioStationRequest.php pass the stored URL through app/Services/RadioService.php to app/Services/Radio/RadioStreamProxy.php, where RadioStreamProxy::openStream() calls fopen($url, 'r', false, $context). Streaming /radio/stream/{id} returns the upstream response body, allowing access to loopback, RFC1918, Docker bridge, metadata, or other internal HTTP services reachable from the Koel server. This issue is fixed in version 9.7.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-54493 since 06/15/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit.

By approaching the search of inurl:app/Services/Radio/RadioStreamProxy.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 9.7.0 eliminates this vulnerability.

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

Productinfo

Name

• Koel

Version

• 9.0
• 9.1
• 9.2
• 9.3
• 9.4
• 9.5
• 9.6

Website

• Product: https://github.com/koel/koel/

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

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