The vulnerability was used in the wild to compromise websites with vulnerable plugin. The attackers can modify the pluginтАЩs settings.
CVSSv3 score: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N/E:H/RL:O/RC:C
CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data in the "wp-admin/admin-ajax.php" file with the "aj_steps" AJAX action. A remote authenticated attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
Note: the vulnerability is being actively exploited in the wild.