CVE-2026-19861: JetFormBuilder < 3.6.5.2 - Unauthenticated Stored XSS via WYSIWYG Field in Notification Emails
Published Sep 5, 2026
·Updated
The JetFormBuilder — Dynamic Blocks Form Builder WordPress plugin before 3.6.5.2 does not properly sanitise and escape a form field's value before including it in the HTML notification emails it sends, allowing unauthenticated users to inject arbitrary HTML into messages delivered to administrators and other recipients. Whether injected script executes depends on the recipient's mail client, but the injected markup is rendered regardless.
Affected Software
1 affected component
JetFormBuilder JetFormBuilder WordPress plugin<3.6.5.2
Event History
Sep 5, 2026
CVE Published
via MITRE·06:00 AM
Data Sourced
via MITRE·06:00 AM
DescriptionWeakness
Frequently Asked Questions
1
Which plugin versions are affected?
JetFormBuilder versions before 3.6.5.2 are affected.
2
Does exploitation require a WordPress account or other authentication?
No. An unauthenticated attacker can submit a crafted value through the relevant form field.
3
Will injected JavaScript always execute when a notification is opened?
No. Script execution depends on the recipient's mail client, although the injected HTML markup is rendered in the notification email regardless.