CVE-2026-103540

Summary

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.

Affected Software

Weaknesses

• CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine
• CWE-791: Incomplete Filtering of Special Elements

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

References

• https://vuldb.com/vuln/412350
• https://vuldb.com/vuln/412350/cti
• https://vuldb.com/cve/CVE-2026-103540
• https://vuldb.com/submit/957845
• https://github.com/formtools/core/issues/956
• https://github.com/wawyw/cve_report/blob/main/formtools_1.md

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