Out-of-Bounds Write Vulnerability in Fortinet FortiWeb Products
CVE-2026-40688

6.7MEDIUM

Key Information:

Vendor

Fortinet
Status
Fortiweb
Vendor
CVE Published:
14 April 2026

What is CVE-2026-40688?

An out-of-bounds write vulnerability exists in Fortinet FortiWeb versions 8.0.0 to 8.0.3, 7.6.0 to 7.6.6, and 7.4.0 to 7.4.11. This vulnerability could enable an attacker to execute unauthorized code or commands, significantly compromising the integrity and availability of the affected systems. Organizations using these versions should prioritize updating their FortiWeb solutions to mitigate the risk associated with this security flaw. For detailed guidance, refer to the Fortinet Advisory.

Affected Version(s)

FortiWeb 8.0.0 <= 8.0.3

FortiWeb 7.6.0 <= 7.6.6

FortiWeb 7.4.0 <= 7.4.11

References

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

CVSS V3.1

Score:
6.7
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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