CVE-2026-54492: Koel: Authenticated Blind SSRF via Subsonic Podcast Channel Creation

July 15, 2026

Koel v9.6.0 protects the regular podcast subscription API with SafeUrl, but the Subsonic-compatible createPodcastChannel.view route does not apply the same protection. An authenticated user can supply a private URL and cause Koel to fetch it server-side during podcast parsing.

This was validated against v9.6.0 (352ea5ec27fa22294da8fb6beacb3d5552f0d09c) using the official phanan/koel:9.6.0 image.

This is distinct from GHSA-7j2f-6h2r-6cqc, which fixed unsafe episode enclosure URLs in versions <= 9.3.4. The issue here is a newer validation gap in the Subsonic route itself, still present in v9.6.0.

References

Code Behaviors & Features

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