Vulnerability in JetFormBuilder — Dynamic Blocks Form Builder — CVE-2026-103912

What to do now

Update JetFormBuilder — Dynamic Blocks Form Builder to 3.6.6.1 or later.

Affected versions

• Everything up to and including 3.6.6

The JetFormBuilder — Dynamic Blocks Form Builder plugin for WordPress is vulnerable to Reflected DOM-Based Cross-Site Scripting via the '<attacker-chosen query var name matching the preset's query_var setting>' parameter in all versions up to, and including, 3.6.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. This is only exploitable on pages embedding a form that has a text field configured with a query_var Dynamic Preset and a data-jfb-macro or JFB_FIELD:: macro reference targeting that field, both of which are standard, documented plugin features.

This description is reproduced verbatim from the public vulnerability record.

• https://www.wordfence.com/threat-intel/vulnerabilities/id/e75b6080-25e8-462c-b785-dbdacc10dfe6?source=api-prod

Part of this record comes from Wordfence Intelligence. Original: https://www.wordfence.com/threat-intel/vulnerabilities/id/e75b6080-25e8-462c-b785-dbdacc10dfe6
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