Medium 6.3Published Oct 1, 2026

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

Updated under an hour ago (2026-10-19 06:25 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 6.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C
Weakness (CWE): CWE-1336, CWE-791
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulDB
NVD analysis: Deferred
Record last updated: Oct 1, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

formtools.org Form Tools form_tools:form_tools	3.1.0; 3.1.1	CNA record

References

https://vuldb.com/vuln/412350vdb-entry, technical-description
https://vuldb.com/vuln/412350/ctisignature, permissions-required
https://vuldb.com/cve/CVE-2026-103540third-party-advisory
https://vuldb.com/submit/957845third-party-advisory
https://github.com/formtools/core/issues/956issue-tracking
https://github.com/wawyw/cve_report/blob/main/formtools_1.mdexploit

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.