GHSA-W79M-F3JX-779V Koel: Authenticated Blind SSRF via Subsonic Podcast Channel Creation

Summary 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...