Koel: Authenticated Full-Read SSRF via Subsonic Internet Radio Stations (CVE-2026-54493) | HOL Guard CVE

High · CVSS 7.7CVE-2026-54493GHSA-6P96-CFG5-4VHP

Koel: Authenticated Full-Read SSRF via Subsonic Internet Radio Stations

Answer in brief

CVE-2026-54493 records a High severity (CVSS 7.7) vulnerability in Koel: Authenticated Full-Read SSRF via Subsonic Internet Radio Stations. 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: High · CVSS 7.7
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.7. 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 createInternetRadioStation.view and updateInternetRadioStation.view routes accept an authenticated user's streamUrl without the SafeUrl and HasAudioContentType checks used by the regular radio API. app/Http/Requests/Subsonic/CreateInternetRadioStationRequest.php and app/Http/Requests/Subsonic/UpdateInternetRadioStationRequest.php pass the stored URL through app/Services/RadioService.php to app/Services/Radio/RadioStreamProxy.php, where RadioStreamProxy::openStream() calls fopen($url, 'r', false, $context). Streaming /radio/stream/{id} returns the upstream response body, allowing access to loopback, RFC1918, Docker bridge, metadata, or other internal HTTP services reachable from the Koel server. This issue is fixed in version 9.7.0.

Quoted source text, attributed separately from HOL analysis.