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CVE-2026-1239 – Unauthenticated Form Submission Disclosure – Ninja Forms WordPress Plugin (≤ 3.14.1)

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Summary

CVE-2026-1239 is a missing authorization vulnerability in the Ninja Forms – The Contact Form Builder That Grows With You WordPress plugin, affecting all versions up to and including 3.14.1. The flaw resides in the ninja-forms-views/token/refresh REST API callback, which performs no authorization check, allowing any unauthenticated remote attacker to obtain valid access tokens and view all form submissions stored by the plugin. With a CVSS v3.1 score of 7.5 (High) and 600,000+ active installations, the vulnerability represents a significant risk of sensitive data exposure across a wide range of WordPress-powered sites.

Technical details

  • Root cause: Missing authorization check (CWE-862) on the ninja-forms-views/token/refresh REST API endpoint; the callback can be invoked by any HTTP client without credentials or prior authentication.
  • Trigger conditions: A single unauthenticated POST request to the publicly exposed REST endpoint (/wp-json/ninja-forms-views/token/refresh) is sufficient to retrieve a valid access token.
  • Attack vector: Network — no authentication, no local access, and no user interaction required (CVSS: AV:N/AC:L/PR:N/UI:N).
  • Impact: An attacker in possession of a valid token can read all form submissions for any form on the site. Form submissions routinely contain sensitive personally identifiable information (PII) such as names, email addresses, phone numbers, and other user-supplied data, constituting a high-severity confidentiality breach (C:H).

Affected software

  • Ninja Forms – The Contact Form Builder That Grows With You (WordPress plugin): all versions up to and including 3.14.1

Severity

CVSS v3.1 base score: 7.5 (High)
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: Update the Ninja Forms plugin to version 3.14.2 or later. The 3.14.2 release (04 March 2026) addressed this issue with two explicit security enhancements: "protect block token/refresh endpoint against unauthorized access" and "add capability check to render_callback for blocks", as documented in the official plugin changelog.
  • If immediate patching is not possible: Restrict unauthenticated access to the WordPress REST API at the server or WAF level, or temporarily disable the Ninja Forms submissions block feature until the plugin can be updated.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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