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TI-2026-37274 Aliases CVE-2026-50552GHSA-jr4p-4xjh-fwvw

Koel: Server-Side Request Forgery (SSRF) in radio station creation due to missing validation bail

Priority MEDIUM 61CWE-918Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

Koel is a free, open-source music streaming solution. Prior to version 9.7.1, Koel contains a Server-Side Request Forgery (SSRF) vulnerability in the radio station creation endpoint (POST /api/radio/stations). The url field validation rules are declared without the bail keyword, so the HasAudioContentType rule — which issues HTTP requests to the supplied URL — still executes even after the SafeUrl rule has rejected the URL as pointing to a private/reserved address. Any authenticated, non-admin user can therefore coerce the server into making HEAD/GET requests to arbitrary internal hosts. This issue has been patched in version 9.7.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00169 6th percentileScored 2026-11-07
Fix Fixed koel (koel): 9.7.1phanan/koel (Packagist): 9.7.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
koelkoelbefore 9.7.19.7.1Patch availableCNA
—phanan/koel (Packagist)before 9.7.19.7.1Patch availableGHSA-jr4p-4xjh-fwvw
  • koel Vendorkoel Affected before 9.7.1 Fixed in 9.7.1 Patch available CNA
  • phanan/koel (Packagist) Vendor— Affected before 9.7.1 Fixed in 9.7.1 Patch available GHSA-jr4p-4xjh-fwvw

Remediation

  • Fix · CNA koel (koel) Fixed in 9.7.1
  • Fix · GHSA-jr4p-4xjh-fwvw phanan/koel (Packagist) Fixed in 9.7.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-50552
  2. 2026-10-03 Alias added: GHSA-jr4p-4xjh-fwvw

References

Advisory 1

Other 5

  • TI-2026-39339 Koel: Authenticated Full-Read SSRF via Subsonic Internet Radio Stations CVSS 3.1HIGH 7.7
  • TI-2026-34840 Koel Vulnerable to SSRF via Podcast Episode Enclosure URLs CVSS 3.1HIGH 7.7
  • TI-2026-39337 Koel: Incomplete fix for CVE-2026-47260 — systemic SSRF in podcast & radio fetch paths CVSS 3.1HIGH 7.1
  • TI-2026-39340 Server-side request forgery in koel CVSS 4.0MEDIUM 5.3
  • TI-2026-39338 Koel: Authenticated Blind SSRF via Subsonic Podcast Channel Creation CVSS 3.1MEDIUM 4.3
  • TI-2021-12956 Koel before 5.1.4 lacks login throttling, lacks a password strength policy, and shows… CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences