CVE-2026-44400: Mailenable

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

MailEnable Enterprise Premium 10.55 and earlier contains an improper authorization vulnerability in the WebAdmin mobile portal that allows attackers to bypass authentication checks by reusing AuthenticationToken cookies generated for low-privileged users. Attackers can obtain a token from the WebMail login endpoint using the PersistentLogin parameter and replay it against the WebAdmin portal to perform highly privileged administrative actions.

Affected products

• Mailenable Mailenable: before 10.56 (fixed in 10.56)

Published 2026-05-08. Last modified 2026-06-17.