The check-email plugin before 0.5.2 for WordPress has XSS.
https://wordpress.org/plugins/check-email/#developers
Source: Mitre, NVD
Published: 2019-08-27
Updated: 2019-08-29
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: 0.0019