CVE-2026-65608 — Grav versions >= 1.7.0 and before 2.0.9 contain a remote code execution vulnerability.¶

Key facts

CVE-2026-65608 is a High (8.8) vulnerability: Grav versions >= 1.7.0 and before 2.0.9 contain a remote code execution vulnerability.. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-65608
Severity	High (8.8)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-65608/

Details¶

English | 한국어

Description¶

Grav versions >= 1.7.0 and before 2.0.9 contain a remote code execution vulnerability. FlexDirectory::dynamicDataField() resolves blueprint data-*@: directives by calling call_user_func_array() on attacker-influenced input, validating only that the target is callable (is_callable()) without restricting dangerous functions such as exec, system, passthru, or shell_exec. Because FlexDirectory registers this handler for every Flex directory, it bypasses the validation added to Blueprint::dynamicData() in 2.0.7 (GHSA-fj2p-qj2f-74v5). Any authenticated user with create or update permission on any Flex-based directory (Flex Users, Flex Pages, Flex Objects, or custom Flex types) can execute arbitrary shell commands on the server.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-65608
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-2026-65608/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-2026-65608

# 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/getgrav/grav/commit/fae9e1bf2c40ce0b50d0dfce647aaa1d22f98969
https://github.com/getgrav/grav/security/advisories/GHSA-c4wf-2xxc-68qm
https://www.vulncheck.com/advisories/grav-before-remote-code-execution-via-flexdirectory
https://github.com/getgrav/grav/security/advisories/GHSA-c4wf-2xxc-68qm

Generated by PoC Generator on 2026-08-10T14:51:38.399587743

Frequently asked questions¶

What is CVE-2026-65608?¶

CVE-2026-65608 is a High (8.8) vulnerability: Grav versions >= 1.7.0 and before 2.0.9 contain a remote code execution vulnerability.. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-65608?¶

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-2026-65608?¶

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.