Reported vulnerability

JetFormBuilder — Dynamic Blocks Form Builder < 3.6.5.2 - Unauthenticated Arbitrary Shortcode Execution

Q: Which versions of JetFormBuilder — Dynamic Blocks Form Builder are affected?

Wordfence lists these affected versions: Start version unspecified, before 3.6.5.2. Use the version checker above to compare your installed release with this report.

Q: Is a fix available for JetFormBuilder — Dynamic Blocks Form Builder?

Wordfence reports a fix for this issue in JetFormBuilder — Dynamic Blocks Form Builder. It lists these fixed versions: 3.6.5.2. Back up your website and test the recommended update before applying it to your live site.

Q: Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Published 3 Sept 2026

Updated 9 Sept 2026

CVE-2026-19859

Compare your installed software with the affected versions below. Follow the source’s remediation guidance and test an available update after taking a backup. A database entry describes a reported issue; it does not establish whether a particular website has been compromised.

Does this affect my version?

Check your installed version against this advisory. This compares the report’s version ranges and does not scan your website.

Wordfence advisory

critical · CVSS 9.8

The JetFormBuilder — Dynamic Blocks Form Builder plugin for WordPress is vulnerable to Remote Code Execution in all versions up to 3.6.5.2. This is due to unsanitized request-supplied message content being passed through shortcode expansion before escaping was applied, and an incorrect escaping order in sanitize_wysiwyg() (wp_kses_post before wp_specialchars_decode) that allowed entity-encoded payloads to survive sanitization and be decoded in time for shortcode parsing. This makes it possible for unauthenticated attackers to execute arbitrary shortcodes registered on the site by injecting shortcode syntax into form message content that is displayed on any page rendering a JetFormBuilder form.

Severity vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

JetFormBuilder — Dynamic Blocks Form Builder

Software: plugin · jetformbuilder
Affected versions: Start version unspecified, before 3.6.5.2
Fix availability: Fix available
Fixed versions: 3.6.5.2

Recommended action

Update to version 3.6.5.2, or a newer patched version

Further references (1)

wordfence.com/threat-intel/vulnerabilities/id/11f367a0-3a1a-474b-8dae-b3b0f942574a?source=api-prod

Data sources and licences

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CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

Read licence terms

Source: Wordfence

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Questions about this vulnerability

Which versions of JetFormBuilder — Dynamic Blocks Form Builder are affected?

Wordfence lists these affected versions: Start version unspecified, before 3.6.5.2. Use the version checker above to compare your installed release with this report.

Is a fix available for JetFormBuilder — Dynamic Blocks Form Builder?

Wordfence reports a fix for this issue in JetFormBuilder — Dynamic Blocks Form Builder. It lists these fixed versions: 3.6.5.2. Back up your website and test the recommended update before applying it to your live site.

Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Does an affected version mean my website has been hacked?

An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.

These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.

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