CVE-2026-103540CWE-1336CWE-791

CVE-2026-103540

Medium · published October 1, 2026

CVSS v3.1
6.3
EPSS
0%
Percentile
13.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0
5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
EPSS
0.00237 · 13.9th percentile
Weaknesses
CWE-1336 · Improper Neutralization of Special Elements Used in a Template Engine; CWE-791 · Incomplete Filtering of Special Elements
Published
2026-10-01T10:17Z
References (6)
https://github.com/formtools/core/issues/956 · [email protected]https://github.com/wawyw/cve_report/blob/main/formtools_1.md · [email protected]https://vuldb.com/cve/CVE-2026-103540 · [email protected]https://vuldb.com/submit/957845 · [email protected]https://vuldb.com/vuln/412350 · [email protected]https://vuldb.com/vuln/412350/cti · [email protected]
EPSS history
Timeline
  • 03 OCT 03:41Z
    EPSS moved — → 0%
    epss
  • 01 OCT 05:15Z
    formtools.org Form Tools Client Settings Clients.class.php updateClientSettingsTab special elements in template engine
    cvelistv5