Vulnerability in Formtools.org Form Tools
CVE-2026-103540
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Formtools.org Form Tools — versions 3.1.0, 3.1.1
Weakness classification (CWE)
References
- vuldb.com/vuln/412350 (technical-description, vdb-entry)
- vuldb.com/vuln/412350/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-103540 (third-party-advisory)
- vuldb.com/submit/957845 (third-party-advisory)
- github.com/formtools/core/issues/956 (issue-tracking)
- github.com/wawyw/cve_report/blob/main/formtools_1.md (exploit)
Frequently asked questions
- What is CVE-2026-103540?
- CVE-2026-103540 is a medium-severity vulnerability in Formtools.org Form Tools, classified under CWE-791. CVSS score: 6.3/10. Published 2026-10-01.
- How severe is CVE-2026-103540?
- Medium severity. CVSS v3 base score is 6.3 out of 10.