Review reviewHigh

CVE-2026-40688

Fortinet FortiWeb, fortiweb

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.

CVSS
7.2
EPSS
6.44%
93.0% percentile
CISA KEV
Not listed
Published
2026.04.15
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability6.44%
Technical severityCVSS 7.2

Vulnerability overview

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.

Affected product and versions

Product
Fortinet FortiWeb, fortiweb
Affected versions
>= 8.0.0 <= 8.0.3, >= 7.6.0 <= 7.6.6, >= 7.4.0 <= 7.4.11, >= 7.4.0 < 7.4.12, >= 7.6.0 < 7.6.7, >= 8.0.0 < 8.0.4
Fixed versions
7.4.12, 7.6.7, 8.0.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Fortinet FortiWeb, fortiweb and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-787
CVE-2026-40688 — Fortinet FortiWeb, fortiweb | SECUFOCUS NOW