WordPress Contact Form 7 Database Plugin Stored XSS Vulnerability

The Database for CF7 plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Array Form Field Values in all versions up to, and including, 1.2.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is exploitable by unauthenticated attackers because Contact Form 7 accepts array-structured input for ordinary text fields (e.g., your-name[]) via the public REST API endpoint /wp-json/contact-form-7/v1/contact-forms/{id}/feedback, and the plugin stores submitted data using $wpdb INSERT with serialize() into a custom wp_cf7db table, bypassing WordPress save-time filtering via wp_insert_post/wp_kses.

Casky was already ahead

This CVE exploits attack patterns that Casky's 322matched 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 Database for CF7 plugin for WordPress contains a stored cross-site scripting (XSS) vulnerability affecting all versions up to 1.2.6. This flaw exploits insufficient input sanitization on array-structured form fields, allowing unauthenticated attackers to inject malicious scripts that persist in the database and execute whenever any user accesses the compromised page. With a CVSS score of 7.2, this vulnerability poses a significant risk to WordPress installations using this plugin, particularly those relying on Contact Form 7 for user interaction. The impact extends beyond individual site compromise—injected scripts can steal session tokens, redirect users to malicious sites, or harvest sensitive form data from all visitors.

Casky.ai's 322 mapped skills leverage Claude AI with extended reasoning to detect the attack patterns underlying this vulnerability across MITRE ATT&CK techniques TA0001 (Initial Access) and TA0043 (Reconnaissance). Practitioners using Casky would identify suspicious POST requests to contact form endpoints containing HTML/JavaScript payloads in array field parameters, coupled with database INSERT operations storing unescaped content. The platform's detection would flag CWE-79 violation patterns—specifically where user-supplied data reaches the DOM without proper output encoding. Security teams would see findings highlighting the absence of wp_kses_post() or similar sanitization functions, combined with direct echoing of array values in page rendering, allowing them to pinpoint vulnerable code paths and prioritize remediation before exploitation occurs.

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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 →

322 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-13425.

Abuse of Public-Facing API: Mobile API Abuse

mobile security · low

Run

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

MITRE ATT&CK Techniques

TA0001 TA0043

Investigate the attack patterns behind CVE-2026-13425

Casky has 322 skills that investigate the attack patterns behind CVE-2026-13425. Run one and get CVSS-scored findings in 3 minutes.

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