The School Management WordPress plugin before 9.9.7 contains an obfuscated backdoor injected in it's license checking code that registers a REST API handler, allowing an unauthenticated attacker to execute arbitrary PHP code on the site.
https://github.com/w4r3s/cve-2022-1609-exploit
https://github.com/syscall21h/cve-2022-1609-exploit
https://github.com/realsiao/cve-2022-1609-exploit
https://github.com/WitchWatcher/cve-2022-1609-exploit
https://github.com/0x007f/cve-2022-1609-exploit
https://github.com/savior-only/CVE-2022-1609
https://wpscan.com/vulnerability/e2d546c9-85b6-47a4-b951-781b9ae5d0f2/