# CVE-2026-102391: Crocoblock JetFormBuilder cross-site scripting

Source: https://junglewise.ai/threats/cve-2026-102391-unauthenticated-cross-site-scripting-xss-in-jetformbuilder-3-6-5  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-30. Updated: 2026-09-30  
License: CC BY 4.0 with a link back

CVE-2026-102391 · Severity: high · CVSS 7.1 · Published 2026-09-30

JetFormBuilder is a WordPress form builder plugin that allows users to create custom forms on websites. An unauthenticated attacker can inject malicious scripts through the form interface, which execute in visitors' browsers and can steal data or hijack accounts. This vulnerability affects versions up to 3.6.5.4 and has been patched in version 3.6.6.

Technologies: [Crocoblock JetFormBuilder](https://junglewise.ai/threats/technologies/jetformbuilder). Vendors: [Crocoblock](https://junglewise.ai/threats/vendors/crocoblock).

## Quick answers

**Is CVE-2026-102391 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-102391 being exploited in the wild.

**How severe is CVE-2026-102391?** High severity, with a CVSS score of 7.1, published 30 September 2026.

**Which products and versions are affected?** Crocoblock JetFormBuilder <= 3.6.5.4.

**Is there a fix for CVE-2026-102391?** A patch was published on 2026-09-30: patched in version 3.6.6 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-102391 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-102391?** Check whether you run Crocoblock JetFormBuilder at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This is a stored or reflected cross-site scripting (XSS) vulnerability in JetFormBuilder that requires no authentication to trigger but may require user interaction (such as clicking a malicious link or visiting a crafted page). An attacker can inject arbitrary JavaScript that executes in the context of the vulnerable WordPress site, enabling account takeover, session hijacking, or credential theft. The vulnerability was patched in version 3.6.6.

## Affected products

- Crocoblock JetFormBuilder <= 3.6.5.4

## Timeline

- 2026-09-30: disclosed
- 2026-09-30: patched: patched in version 3.6.6

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/wordpress/plugin/jetformbuilder/vulnerability/wordpress-jetformbuilder-plugin-3-6-5-4-cross-site-scripting-xss-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/jetformbuilder/vulnerability/wordpress-jetformbuilder-plugin-3-6-5-4-cross-site-scripting-xss-vulnerability?_s_id=cve)

## Related threats

- [Crocoblock JetFormBuilder stored cross-site scripting](https://junglewise.ai/threats/cve-2026-123482-improper-neutralization-of-input-during-web-page-generation)
- [Crocoblock JetFormBuilder cross-site scripting vulnerability](https://junglewise.ai/threats/cve-2026-123484-improper-neutralization-of-input-during-web-page-generation)
- [Crocoblock JetFormBuilder content injection in form pages](https://junglewise.ai/threats/cve-2026-123860-improper-neutralization-of-script-related-html-tags-in-a-web)
- [Crocoblock JetFormBuilder stored XSS in form fields](https://junglewise.ai/threats/cve-2026-123483-improper-neutralization-of-script-related-html-tags-in-a-web)
- [JetFormBuilder Stored Cross-Site Scripting via form field mapping](https://junglewise.ai/threats/cve-2026-119183-the-jetformbuilder-dynamic-blocks-form-builder-plugin-for)