CVE-2026-100670 — Grav CMS 2.0.14 through 2.0.24 contains a privilege escalation vulnerability in the group…¶

Key facts

CVE-2026-100670 is a High (8.8) vulnerability: Grav CMS 2.0.14 through 2.0.24 contains a privilege escalation vulnerability in the group…. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-100670
Severity	High (8.8)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-100670/

Details¶

English | 한국어

Description¶

Grav CMS 2.0.14 through 2.0.24 contains a privilege escalation vulnerability in the group and account blueprints. The access map is gated by a security@: admin.super guard that is resolved by the field's exact path, so a submitted flat dot-notation key such as access.admin.super (instead of the nested access[admin][super]) matches no blueprint rule, survives BlueprintSchema::filterArray() and flattening, and is written by FlexObject::update() via setNestedProperty(), which splits on . and reconstructs the nested value. An authenticated backend operator using the flex accounts backend who holds admin.users but not admin.super can therefore grant admin.super to their own account or to a group they belong to and escalate to full super-admin, gaining control over configuration, plugin and theme installation, the file manager, and all accounts. Fixed in 2.0.25, which drops any dotted key whose ancestor path is disabled or marked validate.ignore.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-100670
Type	IDOR
CVSS Score	8.8

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-100670/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-2026-100670

# 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/security/advisories/GHSA-mwjj-r7vm-pgqm
https://www.vulncheck.com/advisories/grav-cms-2.0.14-through-2.0.24-privilege-escalation-via-blueprint-guard-bypass

Generated by PoC Generator on 2026-09-27T03:24:27.421098012

Frequently asked questions¶

What is CVE-2026-100670?¶

CVE-2026-100670 is a High (8.8) vulnerability: Grav CMS 2.0.14 through 2.0.24 contains a privilege escalation vulnerability in the group…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-100670?¶

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-2026-100670?¶

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.