CVE-2026-40688

Name: CVE-2026-40688
Creator: NVD / NIST
Published: 2026-04-14T23:16:29.633+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 6.44%

Last modified Jun 17, 2026

CVE-2026-40688 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. An out-of-bounds write vulnerability [CWE-787] vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4.0 through 7.4.11 may allow a remote privileged attacker to execute arbitrary code or command via crafted HTTP requests.. EPSS estimates a 6.44% chance of exploitation in the next 30 days.

Description

An out-of-bounds write vulnerability [CWE-787] vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4.0 through 7.4.11 may allow a remote privileged attacker to execute arbitrary code or command via crafted HTTP requests.

Metrics

CVSS 3.1

7.2/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

6.44%

92.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Fortinet	Fortiweb	>= 7.4.0, < 7.4.12
Fortinet	Fortiweb	>= 7.6.0, < 7.6.7
Fortinet	Fortiweb	>= 8.0.0, < 8.0.4

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-127Vendor Advisory

Timeline

Published: Apr 14, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-40688?

How severe is CVE-2026-40688?

CVE-2026-40688 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 6.44% probability of exploitation in the next 30 days.

How do I fix CVE-2026-40688?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-40688?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST