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CVE-2026-103540— formtools.org Form Tools Client Settings Clients.class.php updateClientSettingsTab special elements in template engine

Quick assessment

Affected
formtools.org Form Tools
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 formtools.org 的 Form Tools（版本 ≤ 3.1.1）中检测到一项安全漏洞。该漏洞影响“客户端设置”组件中 文件里的 函数。对参数 的操纵会导致模板引擎中使用的特殊元素未被正确中和（即存在模板注入风险）。攻击者可远程发起此攻击。该漏洞的利用方法已公开披露，可能被恶意利用。项目方已通过问题报告提前获知该问题，但至今未作出回应。

CVSS 6.3 · Medium

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2026-103540

Vulnerability Information
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Vulnerability Title
formtools.org Form Tools Client Settings Clients.class.php updateClientSettingsTab special elements in template engine
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1336
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
formtools.org Form Tools 3.1.0 cpe:2.3:a:form_tools:form_tools:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-103540

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III. Intelligence Information for CVE-2026-103540

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Other References for CVE-2026-103540 (1)

Same Patch Batch · formtools.org · 2026-10-01 · 3 CVEs total

CVE-2026-103541 6.3 MEDIUM formtools.org Form Tools Ajax actions.php uploadFile unrestricted upload
CVE-2026-103542 4.3 MEDIUM formtools.org Form Tools AJAX Endpoint actions.php smart_fill server-side request forgery

IV. Related Vulnerabilities

Same product: Form Tools
Same vendor: formtools.org
Same weakness: CWE-1336

V. Comments for CVE-2026-103540

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