CVE-2021-26100: Fortinet FortiMail

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

A missing cryptographic step in the Identity-Based Encryption service of FortiMail before 7.0.0 may allow an unauthenticated attacker who intercepts the encrypted messages to manipulate them in such a way that makes the tampering and the recovery of the plaintexts possible.

Affected products

• Fortinet FortiMail: before 7.0.0 (fixed in 7.0.0)

Published 2021-07-09. Last modified 2026-06-17.