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CVE-2026-18438 — The Templately – Elementor & Gutenberg Template Library: 6500+ Free & Pro Ready Templates…

Key facts

CVE-2026-18438 is a High (8.8) vulnerability: The Templately – Elementor & Gutenberg Template Library: 6500+ Free & Pro Ready Templates…. This entry ships a detection-only PoC and a Docker test lab.
CVE CVE-2026-18438
Severity High (8.8)
Detection / prevention —
PoC poc.py
Source 2026/CVE-2026-18438/

Details

English | 한국어

Description

The Templately – Elementor & Gutenberg Template Library: 6500+ Free & Pro Ready Templates And Cloud! plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 3.7.1 via the fetch_remote_file function. This is due to a filename validation/destination mismatch in fetch_remote_file, where file type validation is performed against the attacker-controlled Content-Disposition filename rather than the URL-path-derived destination filename. This makes it possible for authenticated attackers, with contributor-level access and above, to execute code on the server. A GIF+PHP polyglot file passes wp_check_filetype_and_ext validation as image/gif via the Content-Disposition filename, while the actual destination path is written with a .php extension derived from the URL path, bypassing the unfiltered_upload capability gate entirely. The affected endpoints are reachable at this privilege level because Templately's entire REST API — including the cloud import endpoints used in this attack (/templately/v1/clouds/upload and /templately/v1/insert) — is authorized only by a current_user_can('delete_posts') check, with no administrator or manage_options capability requirement. The same permission gate also allows a contributor to overwrite the site's global Templately cloud connection via the /templately/v1/login endpoint with global_signin set to true. A complete remediation should both correct fetch_remote_file to validate the file type against the actual destination filename rather than the Content-Disposition header (and avoid deriving the write path from the request URL), and restrict state-changing Templately REST routes to an appropriate administrator-level capability.

Vulnerability Details

Property Value
CVE ID CVE-2026-18438
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-2026-18438/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-2026-18438

# 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://plugins.trac.wordpress.org/browser/templately/tags/3.6.5/includes/API/API.php#L128
  • https://plugins.trac.wordpress.org/browser/templately/tags/3.6.5/includes/API/Import.php#L78
  • https://plugins.trac.wordpress.org/browser/templately/tags/3.6.5/includes/API/MyClouds.php#L103
  • https://plugins.trac.wordpress.org/browser/templately/tags/3.6.5/includes/Core/Importer/WPImport.php#L1200
  • https://plugins.trac.wordpress.org/browser/templately/tags/3.6.5/includes/Core/Importer/WPImport.php#L1391
  • https://plugins.trac.wordpress.org/browser/templately/tags/3.6.5/includes/Core/Importer/WPImport.php#L1423
  • https://plugins.trac.wordpress.org/browser/templately/tags/3.6.5/includes/Core/Platform/Gutenberg.php#L177
  • https://plugins.trac.wordpress.org/browser/templately/tags/3.7.1/includes/API/API.php#L128
  • https://plugins.trac.wordpress.org/browser/templately/tags/3.7.1/includes/API/Import.php#L78
  • https://plugins.trac.wordpress.org/browser/templately/tags/3.7.1/includes/API/MyClouds.php#L103
  • https://plugins.trac.wordpress.org/browser/templately/tags/3.7.1/includes/Core/Importer/WPImport.php#L1200
  • https://plugins.trac.wordpress.org/browser/templately/tags/3.7.1/includes/Core/Importer/WPImport.php#L1391
  • https://plugins.trac.wordpress.org/browser/templately/tags/3.7.1/includes/Core/Importer/WPImport.php#L1423
  • https://plugins.trac.wordpress.org/browser/templately/tags/3.7.1/includes/Core/Platform/Gutenberg.php#L177
  • https://plugins.trac.wordpress.org/changeset/3636643/templately/trunk/includes/Core/Importer/WPImport.php
  • https://plugins.trac.wordpress.org/changeset?old_path=%2Ftemplately/tags/3.7.1&new_path=%2Ftemplately/tags/3.7.2
  • https://plugins.trac.wordpress.org/changeset?reponame=&new=3636643%40templately%2Ftags%2F3.7.2&old=3624408%40templately%2Ftags%2F3.7.1
  • https://www.wordfence.com/threat-intel/vulnerabilities/id/4e68b2f2-12e4-4ff2-919d-26d6b21acd03?source=cve

Generated by PoC Generator on 2026-08-15T20:41:42.538512998

Frequently asked questions

What is CVE-2026-18438?

CVE-2026-18438 is a High (8.8) vulnerability: The Templately – Elementor & Gutenberg Template Library: 6500+ Free & Pro Ready Templates…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-18438?

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-2026-18438?

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.