formtools.org Form Tools Client Settings Clients.class.php updateClientSettingsTab special elements in template engine (CVE-2026-103540) | HOL Guard CVE

Medium · CVSS 5.3CVE-2026-103540

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

Answer in brief

CVE-2026-103540 records a Medium severity (CVSS 5.3) vulnerability in formtools.org Form Tools Client Settings Clients.class.php updateClientSettingsTab special elements in template engine. The current sources do not mark it as known exploited. The current feed maps formtools.org/Form Tools (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 1, 2026Updated Oct 1, 2026Source checked Oct 1, 2026First seen by HOL Oct 1, 2026Material review Oct 1, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps formtools.org/Form Tools (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
formtools.org/Form Toolsgeneric	3.1.0 \|\| 3.1.1	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for formtools.org/Form Tools.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 1, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.