CVE-2026-55573 — e107 is a content management system (CMS).¶
Key facts
CVE-2026-55573 is a Critical (9.8) vulnerability: e107 is a content management system (CMS).. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-55573 |
| Severity | Critical (9.8) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-55573/ |
Details¶
English | 한국어
Description¶
e107 is a content management system (CMS). Prior to 2.3.7, install.php decodes the attacker-controlled previous_steps POST parameter and passes it to unserialize() at file scope and again in the e_install constructor without restricting allowed classes. The installer remains accessible after a normal installation, and a crafted object graph using the bundled GuzzleHttp\Psr7\PumpStream class can flow through paths.hash into site_path, where string coercion invokes an attacker-controlled callable. An unauthenticated attacker who can reach install.php can therefore execute arbitrary PHP functions with the web server process's privileges, leading to full server compromise. This issue is fixed in version 2.3.7.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-55573 |
| CVSS Score | 9.8 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-55573/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-2026-55573
# 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/e107inc/e107/commit/5d6d649e8cf01854d6024d07997c2449fdd75f24
- https://github.com/e107inc/e107/commit/6c404295213952aedb9b3689be19dd4c7ba550b0
- https://github.com/e107inc/e107/releases/tag/v2.3.7
- https://github.com/e107inc/e107/security/advisories/GHSA-c8h6-wpj3-4cr8
Generated by PoC Generator on 2026-10-15T12:50:24.905346874
Frequently asked questions¶
What is CVE-2026-55573?¶
CVE-2026-55573 is a Critical (9.8) vulnerability: e107 is a content management system (CMS).. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-55573?¶
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-2026-55573?¶
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.