What is CVE-2026-39811?

CVE-2026-39811 is a medium-severity vulnerability in Fortinet Fortiweb, classified under Integer Overflow or Wraparound. CVSS score: 4.4/10. Published 2026-04-14.

How severe is CVE-2026-39811?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Integer overflow in Fortinet Fortiweb

CVE-2026-39811

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…

Vulnerability class: Integer Overflow

EPSS: 0.001 (33.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C.

Affected products

Fortinet Fortiweb — versions 8.0.0, 7.6.0, 7.4.0

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-108

Frequently asked questions

What is CVE-2026-39811?: CVE-2026-39811 is a medium-severity vulnerability in Fortinet Fortiweb, classified under Integer Overflow or Wraparound. CVSS score: 4.4/10. Published 2026-04-14.
How severe is CVE-2026-39811?: Medium severity. CVSS v3 base score is 4.4 out of 10.