Ninja Forms Missing Authorization Check Exposes Sensitive Submissions

The Ninja Forms – The Contact Form Builder That Grows With You plugin for WordPress is vulnerable to unauthorized access of data due to a missing authorization check on the 'ninja-forms-views/token/refresh' REST callback in all versions up to, and including, 3.14.1. This makes it possible for unauthenticated attackers to view form submissions, which could potentially contain sensitive information.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

The Ninja Forms WordPress plugin fails to properly validate user permissions on its REST API token refresh endpoint, allowing unauthenticated attackers to access form submission data without authentication. This vulnerability affects all versions through 3.14.1 and impacts any WordPress installation using this popular contact form builder. Organizations relying on Ninja Forms to collect customer inquiries, support requests, or other sensitive data face immediate risk of unauthorized information disclosure—attackers could potentially harvest personally identifiable information (PII), credentials, or other confidential details submitted through these forms without triggering any authentication mechanisms.

Casky's platform maps this vulnerability to improper authorization patterns under MITRE ATT&CK TA0004 (Privilege Escalation) and TA0006 (Credential Access), leveraging Claude's extended reasoning across 283 relevant security skills. Practitioners using Casky would detect attack patterns including unauthenticated REST API calls to the token/refresh endpoint, anomalous access to form submission endpoints without valid session tokens, and bulk data retrieval attempts from form storage. The platform's skill-based detection would highlight CWE-862 (Missing Authorization) findings showing where authorization checks are absent or improperly implemented, enabling security teams to quickly identify affected plugin instances and prioritize patching before attackers systematically enumerate and exploit this publicly disclosed vulnerability in their WordPress infrastructure.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-1239.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

analyzing-cloud-storage-access-patterns

cloud security · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

Investigate the attack patterns behind CVE-2026-1239

Casky has 283 skills that investigate the attack patterns behind CVE-2026-1239. Run one and get CVSS-scored findings in 3 minutes.

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