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

CVE-2026-19859Published · Updated

Action summary

Affected: <3.6.5.2Update to 3.6.5.2 or newer

All remediation steps
Watch plugin
Severity
Critical9.8
CVSS
9.8
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:N User interaction
None
S:U Scope
Unchanged
C:H Confidentiality
High
I:H Integrity
High
A:H Availability
High
Weakness
CWE-94 Improper Control of Generation of Code
Required access
No account needed
Exploit prediction (EPSS)
No score
CISA KEV
Not listed
On this page8

Am I affected?

JetFormBuilder — Dynamic Blocks Form Builder jetformbuilder

  1. Affected< 3.6.5.2
  2. Patched in3.6.5.2

Update to 3.6.5.2 or newer.

You are affected if you run < 3.6.5.2. Version 3.6.5.2 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under JetFormBuilder — Dynamic Blocks Form Builder.
  • No admin access? Run a passive check of your site. It reads public files only.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 3.6.5.2, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch JetFormBuilder — Dynamic Blocks Form Builder to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Jakub Herman.

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.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in JetFormBuilder — Dynamic Blocks Form Builder

All 37
More vulnerabilities in JetFormBuilder — Dynamic Blocks Form Builder
SeverityVulnerabilityCVEPublished
High7.2Unauthenticated Stored Cross-Site Scripting
≤3.6.8Update to 3.6.8.1
CVE-2026-123482
Medium6.5Unauthenticated Arbitrary Shortcode Execution
≤3.6.8Update to 3.6.8.1
CVE-2026-123483
High7.2Unauthenticated Stored Cross-Site Scripting
≤3.6.8Update to 3.6.8.1
CVE-2026-123484
Medium6.5Unauthenticated Arbitrary Shortcode Execution
≤3.6.8Update to 3.6.8.1
CVE-2026-123860
High7.2Unauthenticated Stored Cross-Site Scripting via Form Record Preset Source
≤3.6.7Update to 3.6.7.1
CVE-2026-111317

Timeline

  1. CVE published

    Severity critical, CVSS 9.8

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. [object Object] Licensed under the CC BY-SA 4.0.
CVE® identifiers
[object Object]. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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