Emerging Threat: (CVE-2026-10818) WPForms Pro Arbitrary File Upload Leading to Remote Code Execution
CVE-2026-10818 is an arbitrary file upload vulnerability in WPForms Pro, the paid edition of a widely deployed WordPress form builder plugin. It was published on July 25, 2026, with Wordfence as the assigning CNA. The flaw sits in the ajax_chunk_upload_finalize function, which handles the final step of a chunked file upload. File type validation runs after the chunk metadata and the file contents have already been written to disk, and the assembled file is not deleted when that validation fails.