CVE-2026-91831 [LOW] – The Subscribe to Comments WordPress plugin before 2.3.3 does not sanitise newline characte

The Subscribe to Comments WordPress plugin before 2.3.3 does not sanitise newline characters from a notification sender-name setting before using it in e-mail headers, allowing users with Author-level access and above to inject arbitrary e-mail headers, such as a hidden Bcc, and to spoof the sender.