Is CVE-2026-103912 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-103912 being exploited in the wild.

How severe is CVE-2026-103912?

Medium severity, with a CVSS score of 4.7, published 10 October 2026.

Which products and versions are affected?

Crocoblock JetFormBuilder up to and including 3.6.6.

Is there a fix for CVE-2026-103912?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-103912 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-103912?

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.

CVE-2026-103912: JetFormBuilder DOM-based cross-site scripting in query_var preset

CVE-2026-103912 · Severity: medium · CVSS 4.7 · Published 2026-10-10

JetFormBuilder is a form-building plugin for WordPress that allows site owners to create dynamic forms. The plugin is vulnerable to reflected DOM-based cross-site scripting (XSS), allowing attackers to inject malicious scripts that execute in a visitor's browser if they click a malicious link. This could lead to session hijacking, credential theft, or malware distribution targeting site visitors.

Technologies: Crocoblock JetFormBuilder. Vendors: Crocoblock.

Quick answers

Is CVE-2026-103912 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-103912 being exploited in the wild.
How severe is CVE-2026-103912?: Medium severity, with a CVSS score of 4.7, published 10 October 2026.
Which products and versions are affected?: Crocoblock JetFormBuilder up to and including 3.6.6.
Is there a fix for CVE-2026-103912?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-103912 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-103912?: 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

The vulnerability is a reflected DOM-based XSS in the query_var preset functionality caused by insufficient input sanitization and output escaping. Unauthenticated attackers can inject arbitrary JavaScript through attacker-controlled query parameters that match a form's configured query_var setting, particularly when a text field is configured with a Dynamic Preset and referenced via data-jfb-macro or JFB_FIELD:: macros. Exploitation requires tricking a user into clicking a crafted link on a page containing a vulnerable form.

Affected products

CrocoBlock JetFormBuilder up to and including 3.6.6

Timeline

2026-10-10: disclosed

References

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