Freemius WordPress SDK used by 7M sites is vulnerable to XSS attack (CVE-2023-33999) Vulnerability Freemius WordPress SDK used by 7M sites is vulnerable to XSS attack (CVE-2023-33999) Do Son July 18, 2023 0 This specific vulnerability, tagged as CVE-2023-33999, is a site-wide Reflected Cross-Site Scripting (XSS) vulnerability.