Integer Overflow Vulnerability in Fortinet FortiWeb
CVE-2026-39811

4.4MEDIUM

Key Information:

Vendor

Fortinet
Status
Fortiweb
Vendor
CVE Published:
14 April 2026

What is CVE-2026-39811?

An integer overflow vulnerability exists in Fortinet's FortiWeb product, which can lead to a potential denial of service. Versions affected include FortiWeb 8.0.0 through 8.0.3, 7.6.0 through 7.6.6, and all versions of 7.4, 7.2, and 7.0. Attackers may exploit this vulnerability to disrupt service by sending specially crafted inputs, compromising the availability of the application. It is recommended to apply the necessary security patches to safeguard your infrastructure.

Affected Version(s)

FortiWeb 8.0.0 <= 8.0.3

FortiWeb 7.6.0 <= 7.6.6

FortiWeb 7.4.0 <= 7.4.12

References

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

CVSS V3.1

Score:
4.4
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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