CVE-2026-54493

Received Received - Intake

Authentication Bypass in Koel Music Streaming

Publication date: 2026-08-19

Last updated on: 2026-08-21

Assigner: GitHub, Inc.

Description

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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-19

Last Modified

2026-08-21

Generated

2026-09-09

AI Q&A

2026-08-20

EPSS Evaluated

2026-09-07

NVD

CVE-2026-54493

Affected Vendors & Products

Vendor	Product	Version / Range
koel	koel	9.7.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
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.

Attack-Flow Graph

Executive Summary

This vulnerability in Koel versions before 9.7.0 allows authenticated users to access internal HTTP services via crafted radio station URLs. The Subsonic-compatible routes for creating or updating internet radio stations do not properly validate the streamUrl parameter, enabling SSRF attacks through the RadioStreamProxy service.

Detection Guidance

Check Koel version with 'composer show koel/koel' or 'php artisan koel:version'. If version is below 9.7.0, the system is vulnerable. Inspect network traffic for requests to /createInternetRadioStation.view or /updateInternetRadioStation.view with streamUrl parameters pointing to internal services.

Impact Analysis

An attacker could exploit this to access internal services like loopback interfaces, private networks, or Docker containers from the Koel server. This may lead to unauthorized data exposure, service disruption, or further network compromise depending on the exposed services.

Compliance Impact

This vulnerability could violate compliance requirements by enabling unauthorized access to sensitive internal systems, potentially exposing personal data under GDPR or protected health information under HIPAA. Organizations must patch to maintain regulatory compliance.

Mitigation Strategies

Upgrade Koel to version 9.7.0 or later immediately. If immediate upgrade is not possible, restrict access to the vulnerable endpoints by updating firewall rules or web server configuration to block internal network access to /createInternetRadioStation.view and /updateInternetRadioStation.view.

Hi! I’m here to help you understand CVE-2026-54493. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70