Koel: Authenticated Blind SSRF via Subsonic Podcast Channel Creation (CVE-2026-54492) | HOL Guard CVE

Medium · CVSS 4.3CVE-2026-54492GHSA-W79M-F3JX-779V

Koel: Authenticated Blind SSRF via Subsonic Podcast Channel Creation

Answer in brief

CVE-2026-54492 records a Medium severity (CVSS 4.3) vulnerability in Koel: Authenticated Blind SSRF via Subsonic Podcast Channel Creation. The current sources do not mark it as known exploited. The current feed maps phanan/koel (composer), koel/koel (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 19, 2026Updated Sep 9, 2026Source checked Sep 17, 2026First seen by HOL Jul 15, 2026Material review Sep 9, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 4.3
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 4.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps phanan/koel (composer), koel/koel (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
phanan/koelcomposer	<=9.6.0	9.7.0
koel/koelgeneric	< 9.7.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for phanan/koel, koel/koel.
Review the reported fix. Update phanan/koel to 9.7.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 15, 2026

Sources and claim methodology

Upstream source description

Koel is a free, open-source music streaming solution. Prior to 9.7.0, the Subsonic-compatible createPodcastChannel.view route accepts an authenticated user's private URL because app/Http/Requests/Subsonic/CreatePodcastChannelRequest.php does not apply the SafeUrl validation used by the regular podcast API. app/Http/Controllers/Subsonic/CreatePodcastChannelController.php passes the URL to app/Services/Podcast/PodcastService.php, where PodcastService::addPodcast() and createParser() invoke Poddle::fromUrl() during channel creation, causing immediate server-side requests to loopback, Docker bridge, or RFC1918 HTTP destinations. The confirmed impact is blind internal request execution because generic response-body exfiltration was not demonstrated through this route. This issue is fixed in version 9.7.0.

Quoted source text, attributed separately from HOL analysis.