WordPress before 5.2.4 has a Server Side Request Forgery (SSRF) vulnerability because Windows paths are mishandled during certain validation of relative URLs.
https://wpvulndb.com/vulnerabilities/9912
https://wordpress.org/news/2019/10/wordpress-5-2-4-security-release/
https://lists.debian.org/debian-lts-announce/2022/10/msg00010.html
https://lists.debian.org/debian-lts-announce/2020/09/msg00011.html
https://lists.debian.org/debian-lts-announce/2019/11/msg00000.html
https://github.com/WordPress/WordPress/commit/9db44754b9e4044690a6c32fd74b9d5fe26b07b2