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CVE-2026-76836 — AzuraCast exposes the Liquidsoap custom configuration fields through an endpoint that…

Key facts

CVE-2026-76836 is a High (8.8) vulnerability: AzuraCast exposes the Liquidsoap custom configuration fields through an endpoint that…. This entry ships a detection-only PoC and a Docker test lab.
CVE CVE-2026-76836
Severity High (8.8)
Detection / prevention —
PoC poc.py
Source 2026/CVE-2026-76836/

Details

English | 한국어

Description

AzuraCast exposes the Liquidsoap custom configuration fields through an endpoint that does not require the permission guarding them. The backend_config property in backend/src/Entity/Station.php is annotated with GROUP_GENERAL, and PUT /api/station/{station_id}/profile/edit in backend/src/Controller/Api/Stations/ProfileEditController.php deserializes with that group while requiring only StationPermissions::Profile. AbstractArrayEntity::fromArray() then assigns every public property with no field-level permission check, so custom_config_top, custom_config, custom_config_pre_playlists, custom_config_pre_live, custom_config_pre_fade and custom_config_bottom are writable through it. ConfigWriter::writeCustomConfigurationSection() emits those values verbatim into the generated Liquidsoap .liq script, where the process.run() and process.exec() built-ins execute operating system commands when the backend restarts, which the built-in sync task triggers automatically once needs_restart is set. The dedicated endpoint for the same data, PUT /api/station/{id}/liquidsoap-config, requires StationPermissions::Broadcasting, so a station manager holding only the profile permission reaches configuration that the intended boundary reserves for broadcasting operators.

Vulnerability Details

Property Value
CVE ID CVE-2026-76836
Type RCE
CVSS Score 8.8

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-76836/poc.py

Usage

# Run PoC against target
python3 poc.py --target <TARGET_URL>

# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>

⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.

Test Lab

This repository includes a Docker-based test environment with both vulnerable and patched applications.

Quick Start

# Clone and navigate to CVE directory
cd CVE-2026-76836

# Start both applications
docker-compose up -d

# Run tests
./run-tests.sh    # Linux/Mac
./run-tests.ps1   # Windows PowerShell

Application Endpoints

Application URL Status
Vulnerable App http://localhost:8080 Shows vulnerability
Patched App http://localhost:8081 Demonstrates fix

Directory Structure

├── README.md           # English documentation
├── README_KO.md        # Korean documentation
├── poc.py              # PoC detection script
├── docker-compose.yml  # Container orchestration
├── run-tests.sh        # Linux/Mac test runner
├── run-tests.ps1       # Windows test runner
├── vulnerable-app/     # Vulnerable version
│   ├── app.py
│   ├── Dockerfile
│   └── requirements.txt
└── patched-app/        # Fixed version
    ├── app.py
    ├── Dockerfile
    └── requirements.txt

References

  • https://github.com/AzuraCast/AzuraCast
  • https://github.com/AzuraCast/AzuraCast/blob/0.23.8/backend/src/Entity/Station.php
  • https://github.com/AzuraCast/AzuraCast/blob/0.23.8/backend/src/Radio/Backend/Liquidsoap/ConfigWriter.php
  • https://github.com/AzuraCast/AzuraCast/security/advisories/GHSA-q8wg-3qg7-8pc7
  • https://www.vulncheck.com/advisories/azuracast-through-liquidsoap-configuration-write-via-profile-edit-serialization-group-bypass
  • https://github.com/AzuraCast/AzuraCast/security/advisories/GHSA-q8wg-3qg7-8pc7

Generated by PoC Generator on 2026-08-25T06:19:18.307280109

Frequently asked questions

What is CVE-2026-76836?

CVE-2026-76836 is a High (8.8) vulnerability: AzuraCast exposes the Liquidsoap custom configuration fields through an endpoint that…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-76836?

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2026-76836?

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

For authorized security testing and research only. See the full source and NVD record.