CVE-2023-36556: Fortinet FortiMail

High severity, CVSS 8.8. EPSS: 0.8% chance of exploitation in the next 30 days.

An incorrect authorization vulnerability [CWE-863] in FortiMail webmail version 7.2.0 through 7.2.2, version 7.0.0 through 7.0.5 and below 6.4.7 allows an authenticated attacker to login on other users accounts from the same web domain via crafted HTTP or HTTPs requests.

Affected products

• Fortinet FortiMail: from 6.0.0, up to and including 6.0.12; from 6.2.0, up to and including 6.2.9; from 6.4.0, up to and including 6.4.7; from 7.0.0, up to and including 7.0.5; version 7.2.0 only; version 7.2.1 only; …

Published 2023-10-10. Last modified 2026-06-17.