Unauthenticated SQL Injection in Fast Courier WordPress Plugin

The Fast Courier WordPress plugin before 5.2.4 does not sanitize and escape a value before using it in a SQL query on an unauthenticated REST route, allowing unauthenticated attackers to perform SQL injection and read arbitrary data from the database.

Casky was already ahead

This CVE exploits attack patterns that Casky's 323matched 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 Fast Courier WordPress plugin before version 5.2.4 contains a critical SQL injection vulnerability in its unauthenticated REST API endpoint. By failing to sanitize and escape user-supplied input before incorporating it into SQL queries, attackers can inject malicious SQL commands without requiring any authentication. This vulnerability is particularly dangerous because it exposes the entire WordPress database to unauthorized access, allowing threat actors to extract sensitive information including user credentials, personal data, and application secrets. Any WordPress installation using the vulnerable plugin version is at risk, making this a widespread concern across the WordPress ecosystem.

Casky's 323 mapped security skills leverage Claude AI with extended reasoning to detect the attack patterns associated with this vulnerability across two critical MITRE ATT&CK techniques: TA0001 (Initial Access) and TA0043 (Reconnaissance). Practitioners using Casky would observe detection findings focused on anomalous REST API requests containing SQL metacharacters and syntax patterns, unusual database query structures originating from unauthenticated sources, and attempts to access or enumerate database tables and schemas through the vulnerable endpoint. The platform's skills would correlate suspicious HTTP requests to the Fast Courier plugin routes with characteristic SQL injection payloads—such as UNION-based queries, time-based blind injection attempts, and error-based exploitation techniques—enabling security teams to identify both reconnaissance activities probing for the vulnerability and active exploitation attempts in real-time.

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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 →

323 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-89288.

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-2026-89288

Casky has 323 skills that investigate the attack patterns behind CVE-2026-89288. Run one and get CVSS-scored findings in 3 minutes.

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