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CVE-2026-81892 — EasyAdmin is a fast and modern admin generator for Symfony applications.

Key facts

CVE-2026-81892 is a High (8.1) vulnerability: EasyAdmin is a fast and modern admin generator for Symfony applications.. This entry ships a detection-only PoC and a Docker test lab.
CVE CVE-2026-81892
Severity High (8.1)
Detection / prevention —
PoC poc.py
Source 2026/CVE-2026-81892/

Details

English | 한국어

Description

EasyAdmin is a fast and modern admin generator for Symfony applications. From 4.0.0 until 4.29.16 and 5.5.1, EasyAdmin serves all backend requests through a single dashboard route and, for custom actions (Action::linkToRoute() and MenuItem::linkToRoute()), swaps the executed controller based on the routeName query parameter on the kernel.controller event. The swap happens after Symfony's security firewall has already evaluated access_control against the original dashboard URL, and the routeName value was not validated. As a result, a path-based access_control rule protecting the target route was never evaluated, so a low-privilege backend user who can reach a single EasyAdmin URL and knows a target route's name can execute that route's controller, bypassing the path-based rule. Only path-based protections are bypassed. Routes whose controller enforces its own authorization with #[IsGranted] or denyAccessUnlessGranted() remain protected because those checks are recomputed against the swapped-in controller. This issue is fixed in versions 4.29.16 and 5.5.1.

Vulnerability Details

Property Value
CVE ID CVE-2026-81892
Type RCE
CVSS Score 8.1

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-81892/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-2026-81892

# 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/EasyCorp/EasyAdminBundle/commit/03be45c6b7213c4c984a1d0542b7ec60359329f8
  • https://github.com/EasyCorp/EasyAdminBundle/commit/6228dfef598d81eeb0baa35625e50812f3c77699
  • https://github.com/EasyCorp/EasyAdminBundle/releases/tag/v4.29.16
  • https://github.com/EasyCorp/EasyAdminBundle/releases/tag/v5.5.1
  • https://github.com/EasyCorp/EasyAdminBundle/security/advisories/GHSA-g2fm-8hr4-j82h

Generated by PoC Generator on 2026-09-02T19:15:00.349553332

Frequently asked questions

What is CVE-2026-81892?

CVE-2026-81892 is a High (8.1) vulnerability: EasyAdmin is a fast and modern admin generator for Symfony applications.. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-81892?

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-2026-81892?

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.