An issue was discovered in cPanel before 11.109.9999.116. XSS can occur on the cpsrvd error page via an invalid webcall ID, aka SEC-669. The fixed versions are 11.109.9999.116, 11.108.0.13, 11.106.0.18, and 11.102.0.31.
https://forums.cpanel.net/threads/cpanel-tsr-2023-0001-full-disclosure.708949/
https://blog.assetnote.io/2023/04/26/xss-million-websites-cpanel/