An unrestricted file upload vulnerability in the WordPress Simple File List plugin prior to version 4.2.3 allows unauthenticated remote attackers to achieve remote code execution. The plugin's upload endpoint (ee-upload-engine.php) restricts file uploads based on extension, but lacks proper validation after file renaming. An attacker can first upload a PHP payload disguised as a .png file, then use the plugin’s ee-file-engine.php rename functionality to change the extension to .php. This bypasses upload restrictions and results in the uploaded payload being executable on the server.

AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CWE-306

CWE-434

https://packetstorm.news/files/id/160221

https://plugins.trac.wordpress.org/changeset/2286920/simple-file-list

https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/multi/http/wp_simple_file_list_rce.rb

https://simplefilelist.com/

https://vulncheck.com/advisories/wordpress-simple-file-list-plugin-rce

https://web.archive.org/web/20220426044003/https://wpscan.com/vulnerability/10192/

https://wordpress.org/plugins/simple-file-list/

https://www.cybersecurity-help.cz/vdb/SB2020042711

https://www.wordfence.com/threat-intel/vulnerabilities/wordpress-plugins/simple-file-list/simple-file-list-423-remote-code-execution