# Koel SSRF in Subsonic podcast feed and stream helper

Source: https://junglewise.ai/threats/koel-ssrf-in-subsonic-podcast-feed-and-stream-helper-4a257c9c  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-15. Updated: 2026-07-15  
License: CC BY 4.0 with a link back

Severity: medium · CVSS 6.4 · Published 2026-07-15

Koel, a personal music streaming server, is vulnerable to a security flaw where an authenticated user can force the server to make unauthorized requests to internal network services. By providing a malicious podcast feed URL, an attacker could probe internal systems or access data that is not intended to be public. This could lead to the exposure of sensitive internal information or allow an attacker to interact with other services running on the same network as the music server.

Technologies: [phanan/koel (Packagist)](https://junglewise.ai/threats/technologies/phanan-koel). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Medium severity, with a CVSS score of 6.4, published 15 July 2026.

**Which products and versions are affected?** phanan/koel (Packagist) <= 9.6.0.

**Is there a fix for This vulnerability?** A patch was published on 2026-06-04: Version 9.7.0 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is This vulnerability attacked?** It is attacked over the network, in a network appliance.

**Am I affected?** Check whether you run phanan/koel (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A Server-Side Request Forgery (SSRF) vulnerability exists in Koel's Subsonic 'createPodcastChannel.view' endpoint and the 'PodcastService::getStreamableUrl()' method. The Subsonic endpoint fails to apply safe URL checks to user-supplied podcast feed URLs before fetching them server-side. Additionally, the stream helper validates only the initial URL but fails to re-validate subsequent redirect targets followed by the Guzzle HTTP client. An authenticated attacker with a valid Subsonic API key can exploit these gaps to perform blind SSRF against loopback or internal HTTP endpoints. Depending on the response format of the internal service, data may be reflected back to the attacker. The issue is fixed in version 9.7.0.

## Affected products

- phanan Koel <= 9.6.0

## Timeline

- 2026-06-04: disclosed
- 2026-06-04: patched: Version 9.7.0 released
- 2026-07-15: advisory

## References

- [https://api.github.com/users/DavidCarliez](https://api.github.com/users/DavidCarliez)
- [https://github.com/DavidCarliez](https://github.com/DavidCarliez)
- [https://api.github.com/users/DavidCarliez/gists%7B/gist_id%7D](https://api.github.com/users/DavidCarliez/gists%7B/gist_id%7D)
- [https://api.github.com/users/DavidCarliez/repos](https://api.github.com/users/DavidCarliez/repos)
- [https://avatars.githubusercontent.com/u/271374756?v=4](https://avatars.githubusercontent.com/u/271374756?v=4)
- [https://api.github.com/users/DavidCarliez/events%7B/privacy%7D](https://api.github.com/users/DavidCarliez/events%7B/privacy%7D)

## Related threats

- [Koel SSRF via IPv6 transition address bypass in isPublicHost](https://junglewise.ai/threats/cve-2026-54494-koel-ssrf-via-ipv6-transition-address-bypass-in-ispublichost)
- [Koel SSRF in Subsonic Internet Radio Stations](https://junglewise.ai/threats/cve-2026-54493-koel-ssrf-in-subsonic-internet-radio-stations)
- [Koel authenticated blind SSRF in Subsonic podcast creation](https://junglewise.ai/threats/cve-2026-54492-koel-authenticated-blind-ssrf-in-subsonic-podcast-creation)
- [Koel SSRF in podcast and radio fetch paths](https://junglewise.ai/threats/cve-2026-54491-koel-ssrf-in-podcast-and-radio-fetch-paths)
- [Koel SSRF in radio station creation endpoint](https://junglewise.ai/threats/cve-2026-50552-koel-ssrf-in-radio-station-creation-endpoint)