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CVE-2026-18438 is a remote code execution vulnerability in the Templately – Elementor & Gutenberg Template Library plugin for WordPress affecting all versions up to and including 3.7.1. The flaw is in the fetch_remote_file function, which performs file type validation against an attacker-controlled filename supplied via the Content-Disposition header, while the actual file write destination is derived from the URL path. This validation/destination mismatch allows an authenticated attacker to supply a GIF+PHP polyglot that is accepted as an image during validation but ultimately written to disk with a .php extension. The issue bypasses the intended unfiltered_upload capability restriction. Exploitation is facilitated by overly permissive authorization on Templately REST API endpoints, where state-changing routes are protected only by current_user_can('delete_posts'), allowing contributor-level users and above to reach the affected cloud import functionality. A related authorization weakness also permits contributor-level users to overwrite the plugin's global cloud connection settings through the login route when global_signin is enabled.
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No public exploit code observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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