JetFormBuilder <= 3.6.5.4 - Unauthenticated Stored Cross-Site Scripting via 'choice' Post Meta via Insert/Update Post Action
Strategic Overview
- Status
- Patched in 3.6.6
- Affected Plugin
- JetFormBuilder — Dynamic Blocks Form Builder
- Affected Version
<= 3.6.5.4- CVSS
- 7.2High
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2026-97342
At a glance
CVE-2026-97342 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the JetFormBuilder WordPress plugin, affecting versions <= 3.6.5.4. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 3.6.6; sites on affected versions should update now. Disclosed October 2026, reported by UKO.
Vulnerability Overview
The JetFormBuilder — Dynamic Blocks Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'choice' Post Meta via Insert/Update Post Action in all versions up to, and including, 3.6.5.4 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected payload is submitted via the unauthenticated wp_ajax_nopriv_jet_form_builder_submit endpoint, stored verbatim into post meta through the Insert/Update Post action, and later rendered unescaped by the Select Field block template when the get_from_db option generator copies raw meta values into option value attributes and label content.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
JetFormBuilder <= 3.6.5.4 carries this weakness at choice, and reaching it takes no account at all. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For JetFormBuilder the fix is 3.6.6: builds <= 3.6.5.4 are affected, anything from 3.6.6 onward is not.
Remediation
Update to version 3.6.6, or a newer patched version
How does WordSec protect against this?
Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: JetFormBuilder 3.6.6 closes this, and updating the plugin is the step that ends it.
- Firewall
- Login Security
- Alerts
External References
Related records
Same weakness class
Other vulnerabilities in JetFormBuilder — Dynamic Blocks Form Builder
- 9.8CVE-2026-12793: JetFormBuilder <= 3.6.2 Privilege Escalation
CVE-2026-12793 - 9.8CVE-2026-19859: JetFormBuilder Arbitrary Shortcode Execution
CVE-2026-19859 - 8.8CVE-2026-54196: JetFormBuilder Privilege Escalation
CVE-2026-54196 - 8.8CVE-2026-32525: JetFormBuilder — Dynamic Blocks Form Builder RCE
CVE-2026-32525 - 8.8CVE-2023-37866: JetFormBuilder <= 3.0.8 Privilege Escalation
CVE-2023-37866 - 7.5CVE-2026-4373: JetFormBuilder <= 3.5.6.2 Arbitrary File Read
CVE-2026-4373 - 7.2CVE-2024-7291: JetFormBuilder <= 3.3.4.1 Privilege Escalation
CVE-2024-7291 - 6.6CVE-2025-53990: JetFormBuilder <= 3.5.1.2 PHP Object Injection
CVE-2025-53990
Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C