Unvalidated input and lack of output encoding in the Themify Portfolio Post WordPress plugin, versions before 1.1.6, lead to Stored Cross-Site Scripting (XSS) vulnerabilities allowing low-privileged users (Contributor+) to inject arbitrary JavaScript code or HTML in posts where the Themify Custom Panel is embedded, which could lead to privilege escalation.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-24129
• https://wpscan.com/vulnerability/c8537e5f-1948-418b-9d29-3cf50cd8f9a6