CVE-2026-50552
MediumCVSS 6.3Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
Koel is a free, open-source music streaming solution. Prior to version 9.7.1, there is a Server-Side Request Forgery (SSRF) vulnerability in the radio station creation endpoint, allowing the server to be coerced into making requests to arbitrary internal hosts.
Risk Assessment
This vulnerability may lead to unauthorized access to internal resources by authenticated non-admin users, posing a significant threat to data security.
Recommendation
It is recommended to upgrade to version 9.7.1 or later to mitigate this vulnerability and to review access policies for non-admin users.
Other vulnerabilities in Koel
See all- CVE-2026-54494Medium
Koel before version 9.7.1 incorrectly treats NAT64 and 6to4 addresses as public, allowing an authenticated user to place such an address in a podcast RSS and trigger requests to internal services or cloud metadata. The response body is returned to the user.
- CVE-2026-54493High
In Koel before 9.7.0, the Subsonic-compatible createInternetRadioStation.view and updateInternetRadioStation.view routes accept an authenticated user's streamUrl without SafeUrl and HasAudioContentType checks. The stored URL is passed to RadioStreamProxy::openStream(), which calls fopen($url, 'r', false, $context). This allows access to internal HTTP services such as loopback, RFC1918, Docker bridge, or metadata.
- CVE-2026-54492Medium
Koel before version 9.7.0 in the Subsonic createPodcastChannel.view route does not apply SafeUrl validation, allowing an authenticated user to provide a private URL. This causes immediate server-side requests to loopback, Docker bridge, or RFC1918 destinations.
- CVE-2026-54491High
In Koel before 9.7.1, outbound podcast and radio fetch paths perform a point-in-time isPublicHost() or isSafeUrl() check without pinning the validated address, and most paths lack redirect-hop validation. This allows following an attacker-controlled redirect to an internal address or connecting after DNS rebinding. These paths are reachable through podcast and radio APIs, allowing an authenticated user to access internal services or cloud metadata.
- CVE-2026-47260High
Koel is a free, open-source music streaming solution. In versions prior to 9.3.5, Koel did not properly validate podcast episode URLs, allowing for SSRF attacks against internal services.
Original NVD description (English source)
Koel is a free, open-source music streaming solution. Prior to version 9.7.1, Koel contains a Server-Side Request Forgery (SSRF) vulnerability in the radio station creation endpoint (POST /api/radio/stations). The url field validation rules are declared without the bail keyword, so the HasAudioContentType rule — which issues HTTP requests to the supplied URL — still executes even after the SafeUrl rule has rejected the URL as pointing to a private/reserved address. Any authenticated, non-admin user can therefore coerce the server into making HEAD/GET requests to arbitrary internal hosts. This issue has been patched in version 9.7.1.