Cross-Site Request Forgery (CSRF)
The reSmush.it : the only free Image Optimizer & compress plugin WordPress plugin before 0.4.4 does not perform CSRF checks for any of its AJAX actions, allowing an attackers to trick logged in users to perform various actions on their behalf on the site.
CWE-352 - Cross-Site Request Forgery (CSRF)
Cross-Site Request Forgery (CSRF) is a vulnerability that allows an attacker to make arbitrary requests in an authenticated vulnerable web application and disrupt the integrity of the victim’s session. The impact of a successful CSRF attack may range from minor to severe, depending upon the capabilities exposed by the vulnerable application and privileges of the user. An attacker may force the user to perform state-changing requests like transferring funds, changing their email address or password etc. However, if an administrative level account is affected, it may compromise the whole web application and associated sensitive data.