BaseFortify

Publication date: 2025-10-14

Last updated on: 2026-06-09

Assigner: Fortinet, Inc.

Description

An Improper Neutralization of Input During Web Page Generation vulnerability [CWE-79] in FortiOS 7.6.0 through 7.6.3, 7.4.0 through 7.4.7, 7.2 all versions, 7.0 all versions, 6.4 all versions; FortiProxy 7.6.0 through 7.6.3, 7.4.0 through 7.4.9, 7.2 all versions, 7.0 all versions; FortiSASE 25.3.a may allow an unauthenticated attacker to perform a reflected cross site scripting (XSS) via crafted HTTP requests.

CVSS Scores

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Meta Information

Published

2025-10-14

Last Modified

2026-06-09

Generated

2026-07-06

AI Q&A

2025-10-14

EPSS Evaluated

2026-07-05

NVD

CVE-2025-31366

Affected Vendors & Products

Vendor	Product	Version / Range
fortinet	fortios	From 7.4.0 (inc) to 7.4.9 (inc)
fortinet	fortios	From 7.4.0 (inc) to 7.4.9 (inc)
fortinet	fortiproxy	From 7.6.0 (inc) to 7.6.4 (inc)
fortinet	fortisase	25.3.40
fortinet	fortisase	25.3.40

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This vulnerability is an Improper Neutralization of Input During Web Page Generation (CWE-79) found in multiple versions of FortiOS, FortiProxy, and FortiSASE. It allows an unauthenticated attacker to perform a reflected cross-site scripting (XSS) attack by sending crafted HTTP requests. This means that malicious scripts can be injected into web pages viewed by other users.

Impact Analysis

The vulnerability can allow an attacker to execute malicious scripts in the context of a user's browser session, potentially leading to theft of sensitive information, session hijacking, or other malicious actions. Since the attacker can be unauthenticated, it increases the risk of exploitation remotely over the network.

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