CVE-2026-75872: Maalfer Mailerup

Medium severity, CVSS 6.9. EPSS: 0.7% chance of exploitation in the next 30 days.

HTML Injection in the public subscription form in maalfer MailerUp before 1.1.3 allows unauthenticated remote attackers to have the application send a message carrying arbitrary HTML, to an attacker-chosen address and from the form owner's configured sending identity, via the first_name field of the subscription request, which is interpolated unescaped into the double opt-in verification email.

Affected products

• Maalfer Mailerup: before 1.1.3 (fixed in 1.1.3)

Published 2026-08-18. Last modified 2026-09-01.