wordpress is vulnerable to cross-site scripting. The attack is due to lack of validation of parameters in the post previews by authenticated users which allows an attacker to inject and execute arbitrary scripts.
packetstormsecurity.com/files/160745/WordPress-Core-5.2.2-Cross-Site-Scripting.html
lists.debian.org/debian-lts-announce/2019/10/msg00023.html
seclists.org/bugtraq/2020/Jan/8
wordpress.org/news/2019/09/wordpress-5-2-3-security-and-maintenance-release/
wpvulndb.com/vulnerabilities/9862
www.debian.org/security/2020/dsa-4599
www.debian.org/security/2020/dsa-4677