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CVE-2026-54493 high CVSS 7.7

SSRF (Server-Side Request Forgery) in phanan/koel (CVE-2026-54493)

Summary

SSRF in phanan/koel (CVE-2026-54493). Confidential information can be exposed externally. Exploitable via SafeUrl. Mitigation: upgrade to 9.7.0 or later.

Original description

The description as published by the source.

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
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
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 ra…

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-54493 has been found in phanan/koel.
Attackers can target a specific entry point like SafeUrl over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 7.7/10.
What to do: upgrade phanan/koel to 9.7.0 or later.
If unsure, ask your IT team or search "phanan/koel CVE-2026-54493" on the vendor's site.

CVE-2026-54493 (phanan/koel) — CWE-918 / CVSS v3 7.7
Attack vector: remote (network-reachable) / no user interaction
Attack surface: SafeUrl / HasAudioContentType / createInternetRadioStation.view / updateInternetRadioStation.view
Patched: 9.7.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

SSRF (CWE-918) exists in phanan/koel. Attackers reach the vulnerable code path via SafeUrl.

📍 Affected scope

Check the vendor advisory for the affected versions of phanan/koel. Attack surface: SafeUrl / HasAudioContentType / createInternetRadioStation.view / updateInternetRadioStation.view.

🔥 Severity

Severity: High (CVSS 7.7/10). Confidential information can be exposed externally.

🔧 How to fix

Update to 9.7.0.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'phanan/koel' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'phanan/koel' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で phanan/koel を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade phanan/koel to 9.7.0

    ステージング環境で 9.7.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

composer phanan/koel
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.7.0"}]}]
Packagist phanan/koel
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.7.0"}]}]

References

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