JetFormBuilder permits unauthenticated HTML injection into notification email
JetFormBuilder before 3.6.5.2 places unauthenticated form-field values into HTML notification messages without adequate sanitization and escaping. An attacker can inject arbitrary rendered markup into mail delivered to administrators and other recipients; script execution depends on the recipient's mail client.
- Component
- JetFormBuilder — Dynamic Blocks Form Builder
- Plugin slug
jetformbuilder-dynamic-blocks-form-builder- Affected
- < 3.6.5.2
- Safe version
3.6.5.2- Published
- Sep 05, 2026
This CVE was published Sep 05, 2026 and is one of 3 known issues for this plugin.
Update, patch or deactivate.
Update to JetFormBuilder 3.6.5.2 or later and treat unexpected notification messages as untrusted content until affected forms are remediated.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
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.
CVE / CNA vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N