WordPress before 4.9.9 and 5.x before 5.0.1 allows remote code execution because an _wp_attached_file Post Meta entry can be changed to an arbitrary string, such as one ending with a .jpg?file.php substring. An attacker with author privileges can execute arbitrary code by uploading a crafted image containing PHP code in the Exif metadata. Exploitation can leverage CVE-2019-8943.
packetstormsecurity.com/files/152396/WordPress-5.0.0-crop-image-Shell-Upload.html
www.rapid7.com/db/modules/exploit/multi/http/wp_crop_rce
www.securityfocus.com/bid/107088
blog.ripstech.com/2019/wordpress-image-remote-code-execution/
lists.debian.org/debian-lts-announce/2019/03/msg00044.html
wpvulndb.com/vulnerabilities/9222
www.debian.org/security/2019/dsa-4401
www.exploit-db.com/exploits/46511/
www.exploit-db.com/exploits/46662/