CVE-2026-1239 Overview
CVE-2026-1239 is a missing authorization vulnerability in the Ninja Forms – The Contact Form Builder That Grows With You plugin for WordPress. All versions up to and including 3.14.1 are affected. The flaw resides in the ninja-forms-views/token/refresh REST callback, which fails to verify caller permissions before returning data. Unauthenticated attackers can query the endpoint over the network and retrieve form submissions that may contain personally identifiable information (PII), contact details, or other sensitive data collected through WordPress forms. The weakness is classified under CWE-862: Missing Authorization.
Critical Impact
Remote, unauthenticated attackers can read submitted form data from vulnerable WordPress sites, exposing user-submitted content with no authentication required.
Affected Products
- Ninja Forms – The Contact Form Builder That Grows With You (WordPress plugin)
- All versions up to and including 3.14.1
- WordPress sites running the vulnerable plugin with active form submissions
Discovery Timeline
- 2026-07-01 - CVE-2026-1239 published to NVD
- 2026-07-01 - Last updated in NVD database
Technical Details for CVE-2026-1239
Vulnerability Analysis
The vulnerability is a broken access control issue in a REST API callback exposed by the Ninja Forms plugin. The ninja-forms-views/token/refresh route is intended to refresh a token used by authenticated site administrators viewing form submissions. However, the permission_callback for this REST route does not validate the requesting user's capabilities. Any unauthenticated HTTP client can invoke the endpoint through the WordPress REST API and receive data that should only be accessible to privileged users.
Because form submissions frequently contain names, email addresses, phone numbers, message bodies, and in some deployments payment or health-related fields, unauthorized disclosure of this data poses a direct privacy and regulatory risk. The vulnerability affects confidentiality only — integrity and availability are not directly impacted.
Root Cause
The root cause is a missing authorization check ([CWE-862]) on the ninja-forms-views/token/refresh REST callback. The registered route lacks a permission_callback that validates the caller has capabilities such as manage_options or a comparable submission-viewing capability. WordPress REST endpoints must explicitly enforce authorization, and the omission causes the callback to execute for anonymous requests.
Attack Vector
Exploitation requires only network access to the target site's REST API. An attacker sends an unauthenticated HTTP request to /wp-json/ninja-forms-views/token/refresh on a vulnerable WordPress installation. The response returns data that should be gated behind an authenticated administrative session, exposing form submission content. No user interaction, credentials, or preconditions are required.
The vulnerability is described in prose because no verified exploit code has been published. Refer to the Wordfence Vulnerability Report and the WordPress Changeset Update for the specific code changes.
Detection Methods for CVE-2026-1239
Indicators of Compromise
- Unauthenticated HTTP requests to /wp-json/ninja-forms-views/token/refresh in web server access logs
- Anomalous outbound response sizes from the REST endpoint to unknown source IPs
- Repeated REST API enumeration against /wp-json/ninja-forms-views/* routes from a single IP or ASN
Detection Strategies
- Audit WordPress access logs for GET or POST requests to the ninja-forms-views/token/refresh route lacking a valid authenticated session cookie
- Deploy a Web Application Firewall (WAF) rule to alert on anonymous access to Ninja Forms REST routes
- Inventory installed plugin versions across managed WordPress sites and flag any Ninja Forms deployment at or below version 3.14.1
Monitoring Recommendations
- Continuously monitor /wp-json/ traffic patterns for unauthenticated access to plugin-specific namespaces
- Correlate WordPress REST API request logs with authentication events to identify unauthorized data reads
- Track plugin version drift with automated software composition analysis on WordPress hosts
How to Mitigate CVE-2026-1239
Immediate Actions Required
- Update the Ninja Forms plugin to the patched version above 3.14.1 on all WordPress sites in the environment
- Review recent access logs for prior unauthenticated hits to /wp-json/ninja-forms-views/token/refresh to assess potential data exposure
- Notify affected users if form submission data containing PII appears to have been accessed
Patch Information
The issue is addressed in the Ninja Forms code change tracked at the WordPress Changeset Update. Site administrators should apply the fixed version through the WordPress plugin update mechanism. Detailed advisory information is available in the Wordfence Vulnerability Report.
Workarounds
- Temporarily deactivate the Ninja Forms plugin until the update can be applied
- Block anonymous access to /wp-json/ninja-forms-views/token/refresh at the WAF or reverse proxy layer
- Restrict /wp-json/ REST API access to authenticated sessions where business requirements allow
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
