CVE-2026-39811: Fortinet FortiWeb

Medium severity, CVSS 4.9. EPSS: 0.4% chance of exploitation in the next 30 days.

A integer overflow or wraparound vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4 all versions, FortiWeb 7.2 all versions, FortiWeb 7.0 all versions may allow attacker to denial of service via <insert attack vector here>

Affected products

• Fortinet FortiWeb: from 7.0.0, up to and including 7.0.13; from 7.2.0, up to and including 7.2.13; from 7.4.0, up to and including 7.4.12; from 7.6.0, before 7.6.7 (fixed in 7.6.7); from 8.0.0, before 8.0.4 (fixed in 8.0.4)

Published 2026-04-14. Last modified 2026-06-17.