The ao_ccss_import AJAX call in Autoptimize WordPress Plugin 2.7.6 does not ensure that the file provided is a legitimate Zip file, allowing high privilege users to upload arbitrary files, such as PHP, leading to remote command execution.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-24948
Reference (s):
- http://packetstormsecurity.com/files/160850/WordPress-Autoptimize-Shell-Upload.html
- https://wpvulndb.com/vulnerabilities/10372