WordPress Plugin SQL Injection via REST API Coupon Endpoint

The Premium Packages – Sell Digital Products Securely plugin for WordPress is vulnerable to SQL Injection via the 'code' parameter of the POST /wp-json/wpdmpp/v1/cart/coupon REST API endpoint in versions up to, and including, 6.2.0. This is due to insufficient escaping on the user-supplied parameter, which is interpolated directly into a raw SQL query string in the CouponCodes::find() method without use of $wpdb->prepare() or esc_sql(). This makes it possible for unauthenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.

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 Premium Packages – Sell Digital Products Securely plugin for WordPress contains a critical SQL Injection vulnerability in its REST API coupon endpoint that allows unauthenticated attackers to execute arbitrary SQL queries. The flaw exists in the CouponCodes::find() method where the 'code' parameter is directly interpolated into SQL queries without proper escaping or prepared statements. This affects all versions up to 6.2.0 and is particularly dangerous because REST API endpoints bypass traditional authentication checks, making it accessible to any threat actor. E-commerce sites using this plugin to manage digital product sales face immediate risk of data breach, customer credential theft, and potential inventory manipulation.

Casky's 322 mapped skills leverage Claude AI with extended reasoning to detect the attack patterns behind this vulnerability across both MITRE ATT&CK techniques—Initial Access (TA0001) through unauthenticated API abuse and Discovery (TA0043) for database reconnaissance. Practitioners using Casky would identify suspicious REST API calls to /wp-json/wpdmpp/v1/cart/coupon with specially crafted 'code' parameters containing SQL syntax, unusual database query patterns in logs, and evidence of information extraction attempts. The platform's skills correlate these indicators with CWE-89 patterns, flagging attempts to bypass parameterization defenses, revealing the attacker's progression from initial reconnaissance queries to data exfiltration commands—enabling detection before payload execution succeeds.

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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-2026-12800.

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-2026-12800

Casky has 322 skills that investigate the attack patterns behind CVE-2026-12800. Run one and get CVSS-scored findings in 3 minutes.

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