Description
WordPress Plugin Advanced Custom Fields (ACF) is prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input. An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks. WordPress Plugin Advanced Custom Fields (ACF) version 4.4.3 is vulnerable; prior versions may also be affected.
Remediation
Edit the source code to ensure that input is properly sanitised or disable the plugin until a fix is available
References
Related Vulnerabilities
WordPress Exposure of Sensitive Information to an Unauthorized Actor Vulnerability (CVE-2015-5730)
WordPress Plugin Custom Admin Page by BestWebSoft Cross-Site Scripting (0.1.1)
WordPress 4.2.x Multiple Vulnerabilities (4.2 - 4.2.36)
WordPress Plugin WooCommerce Upload My File Cross-Site Request Forgery (0.3.9)
Joomla Unrestricted Upload of File with Dangerous Type Vulnerability (CVE-2018-15882)