CVE-2026-25420: Mailerlite

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Missing Authorization vulnerability in MailerLite MailerLite official-mailerlite-sign-up-forms allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects MailerLite: from n/a through <= 1.7.18.

Affected products

• Mailerlite Mailerlite: up to and including 1.7.18

Published 2026-02-19. Last modified 2026-06-17.