The Custom 404 Pro plugin 3.2.8 for WordPress has XSS via the wp-admin/admin.php?page=c4p-main page parameter.
https://www.pluginvulnerabilities.com/2019/06/25/other-vulnerability-data-sources-miss-that-a-reflected-xss-vulnerability-in-custom-404-pro-hasnt-been-fixed/
https://wordpress.org/plugins/custom-404-pro/#developers
Source: Mitre, NVD
Published: 2019-08-15
Updated: 2026-06-17
Base Score: 4.3
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N
Severity: Medium
Base Score: 6.1
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS: 0.00851