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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 separately from the URL path. This validation-to-destination mismatch allows an authenticated attacker to supply a polyglot payload that is accepted as an image during validation but ultimately written to disk with a server-executable extension. The issue bypasses the intended unfiltered_upload capability restriction because the validation decision is made on the wrong filename. Exploitation is further enabled by overly permissive authorization on Templately REST API endpoints used for cloud import operations, where state-changing routes are gated only by current_user_can('delete_posts'). As a result, contributor-level users and above can reach the affected functionality and achieve server-side code execution.
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No public exploit code observed for this vulnerability.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.