CVE-2026-14556 HappyForms < 1.26.15 - Unauthenticated HTML Injection in Admin Notification Email via client_referer

The HappyForms WordPress plugin before 1.26.15 does not sanitise or escape a user-controlled referral value before embedding it in the form notification email, allowing unauthenticated attackers to inject arbitrary HTML into the emails site administrators receive...