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CVE-2026-12793 – Unauthenticated Privilege Escalation / Admin Account Creation – JetFormBuilder Word

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Summary

CVE-2026-12793 is a critical privilege escalation vulnerability in the JetFormBuilder — Dynamic Blocks Form Builder plugin for WordPress, affecting all versions up to and including 3.6.2. The flaw allows a completely unauthenticated attacker to create a new administrator-level user account on the affected site. It carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: The plugin fails to validate that a form ID supplied in a request actually belongs to a legitimate JetFormBuilder form before it parses the referenced post’s content as a form schema and executes an "Advanced Validation" server-side callback defined in that schema.
  • Trigger conditions: An attacker submits a crafted request containing a manipulated _jet_engine_booking_form_id parameter, pointing the plugin at an attacker-controlled or otherwise arbitrary post whose content is then interpreted as form/validation logic.
  • Attack vector: Network-based, requiring no authentication and no user interaction (AV:N, PR:N, UI:N).
  • Impact: Full compromise of confidentiality, integrity, and availability — the attacker can cause the site to create a new user account with administrator privileges, leading to complete takeover of the WordPress installation.

Affected software

  • JetFormBuilder — Dynamic Blocks Form Builder (WordPress plugin), all versions 0 through 3.6.2 (inclusive).

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update JetFormBuilder to a version newer than 3.6.2 that validates form ownership before processing Advanced Validation server-side callbacks. The plugin vendor has since shipped multiple releases hardening this exact code path (including changes described as "Secure Advanced Validation Server-Side Callbacks with per-form allowlists"); upgrade to the latest available release to ensure the fix and subsequent related hardening are applied.
  • If immediate patching is not possible:
    • Restrict or monitor unauthenticated access to form-submission endpoints exposed by JetFormBuilder.
    • Audit WordPress administrator accounts for any unexpected or recently created users.
    • Consider temporarily disabling JetFormBuilder forms that use Advanced Validation server-side callbacks until patched.
    • Deploy a web application firewall rule to block requests containing anomalous _jet_engine_booking_form_id values targeting non-form posts.

References

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