WordPress through 5.0.3 allows Path Traversal in wp_crop_image(). An attacker (who has privileges to crop an image) can write the output image to an arbitrary directory via a filename containing two image extensions and …/ sequences, such as a filename ending with the .jpg?/…/…/file.jpg substring.
packetstormsecurity.com/files/152396/WordPress-5.0.0-crop-image-Shell-Upload.html
packetstormsecurity.com/files/161213/WordPress-5.0.0-Remote-Code-Execution.html
www.rapid7.com/db/modules/exploit/multi/http/wp_crop_rce
www.securityfocus.com/bid/107089
blog.ripstech.com/2019/wordpress-image-remote-code-execution/
www.exploit-db.com/exploits/46511/
www.exploit-db.com/exploits/46662/