CompTIA Exam CS0-002 Topic 6 Question 45 Discussion

An analyst has received a notification about potential malicious activity against a web server. The analyst logs in to a central log collection server and runs the following command: ''cat access.log.1 | grep ''union''. The output shown below appears:

<68.71.54.117> -- -- [31/Jan/2020:10:02:31 --0400] ''Get /cgi-bin/backend1.sh?id=%20union%20select%20192.168.60.50 HTTP/1.1''

Which of the following attacks has occurred on the server?