cPanel before 78.0.18 offers an open mail relay because of incorrect domain-redirect routing (SEC-483).
https://documentation.cpanel.net/display/CL/78+Change+Log
Source: Mitre, NVD
Published: 2019-07-30
Updated: 2026-06-17
Base Score: 4.3
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N
Severity: Medium
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
EPSS: 0.00206