---
id: CVE-2026-103540
title: >-
  A security vulnerability has been detected in formtools.org Form Tools up to
  3.1.1
summary: >-
  A security vulnerability has been detected in formtools.org Form Tools up to
  3.1.1. This vulnerability affects the function
  Clients::updateClientSettingsTab of the file global/code/Clients.class.php of
  the component Client Settings. The …
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-791
  - CWE-1336
vendor: formtools.org
product: Form Tools
affected:
  - form_tools 3.1.0
  - form_tools 3.1.1
published: '2026-10-01'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T06:17:04.393'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103540'
references:
  - url: 'https://github.com/formtools/core/issues/956'
    label: cna@vuldb.com
  - url: 'https://github.com/wawyw/cve_report/blob/main/formtools_1.md'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-103540'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/957845'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/412350'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/412350/cti'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-01T05:37:57.559Z'
---

## Overview

A security vulnerability has been detected in formtools.org Form Tools up to 3.1.1. This vulnerability affects the function Clients::updateClientSettingsTab of the file global/code/Clients.class.php of the component Client Settings. The manipulation of the argument page_titles leads to improper neutralization of special elements used in a template engine. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used. The project was informed of the problem early through an issue report but has not responded yet.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.