CVE-2021-26099: Fortinet FortiMail

Medium severity, CVSS 4.9. EPSS: 0.5% chance of exploitation in the next 30 days.

Missing cryptographic steps in the Identity-Based Encryption service of FortiMail before 7.0.0 may allow an attacker who comes in possession of the encrypted master keys to compromise their confidentiality by observing a few invariant properties of the ciphertext.

Affected products

• Fortinet FortiMail: from 5.0, before 7.0.0 (fixed in 7.0.0)

Published 2021-07-12. Last modified 2026-06-17.