CraftCMS 3.x < 3.9.15 / 4.x < 4.14.15 / 5.x < 5.6.17 Remote Code Execution

CraftCMS version 3.x prior to 3.9.15 or 4.x prior to 4.14.15 or 5.x prior to 5.6.16 is vulnerable to a Remote Code Execution RCE in the action endpoint. No source data...