formtools.org Form Tools up to 3.1.1 Client Settings Clients.class.php updateClientSettingsTab page_titles special elements in template engine

Summaryinfo

A vulnerability categorized as critical has been discovered in formtools.org Form Tools up to 3.1.1. This issue 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 results in special elements in template engine. This vulnerability is known as CVE-2026-103540. It is possible to launch the attack remotely. Furthermore, an exploit is available. The project was informed of the problem early through an issue report but has not responded yet.

Detailsinfo

A vulnerability was found in formtools.org Form Tools up to 3.1.1. It has been classified as critical. Affected is the function Clients::updateClientSettingsTab of the file global/code/Clients.class.php of the component Client Settings. The manipulation of the argument page_titles with an unknown input leads to a special elements in template engine vulnerability. CWE is classifying the issue as CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. This is going to have an impact on confidentiality, integrity, and availability.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-103540. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details and a public exploit are known. This vulnerability is assigned to T1221 by the MITRE ATT&CK project.

The exploit is shared for download at github.com. It is declared as proof-of-concept. The project was informed of the problem early through an issue report but has not responded yet. By approaching the search of inurl:global/code/Clients.class.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• formtools.org

Name

• Form Tools

Version

• 3.1.0
• 3.1.1

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

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Threat Intelligenceinfo

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Submitinfo

Accepted

• Submit #957845: formtools.org / Form Tools project Form Tools Core 3.1.1 Server Side Template Injection (by wenyouwen)

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