CVE-2026-56062: Quotes llama SQL Injection Vulnerability

CVE-2026-56062 Overview

CVE-2026-56062 is an unauthenticated SQL injection vulnerability affecting the Quotes llama WordPress plugin in versions up to and including 3.1.5. The flaw is classified under CWE-89 (Improper Neutralization of Special Elements used in an SQL Command). Attackers can reach the vulnerable code path over the network without authentication or user interaction, making mass exploitation feasible against exposed WordPress sites.

Critical Impact
Remote unauthenticated attackers can inject arbitrary SQL statements into the WordPress database, exposing stored data and impacting site availability.

Affected Products

Quotes llama WordPress plugin versions <= 3.1.5
WordPress sites running the vulnerable plugin with default configuration
Any hosting environment exposing the plugin's HTTP endpoints to untrusted networks

Discovery Timeline

2026-06-26 - CVE-2026-56062 published to the National Vulnerability Database (NVD)
2026-06-26 - Last updated in NVD database

Technical Details for CVE-2026-56062

Vulnerability Analysis

The vulnerability stems from improper neutralization of user-supplied input before it is concatenated into a SQL query executed by the Quotes llama plugin. Because the affected endpoint does not require authentication, an unauthenticated remote attacker can submit crafted HTTP parameters that break out of the intended query context. Successful exploitation allows the attacker to alter query logic, extract database contents, or influence subsequent application behavior. Confidentiality of stored data is directly at risk, and availability can degrade when injected queries consume database resources.

According to Patchstack, the issue affects all plugin versions through 3.1.5. See the Patchstack SQL Injection Vulnerability advisory for the vendor-neutral technical writeup.

Root Cause

The root cause is unsafe construction of SQL statements using untrusted input, without prepared statements or the WordPress $wpdb->prepare() API. Input received through plugin request handlers is placed directly into query strings, allowing attacker-controlled data to be interpreted as SQL syntax rather than data.

Attack Vector

The attack vector is network-based (AV:N) and requires no privileges or user interaction. An attacker sends crafted HTTP requests to a vulnerable plugin endpoint on a target WordPress site. Because the injection point does not enforce authentication, the exploitation barrier is limited to identifying a target running the plugin. No verified public exploit code or proof-of-concept has been catalogued at the time of publication, and EPSS data indicates a low near-term exploitation probability, though this can change once tooling emerges.

Detection Methods for CVE-2026-56062

Indicators of Compromise

HTTP requests to Quotes llama plugin endpoints containing SQL metacharacters such as ', --, UNION SELECT, SLEEP(, or INFORMATION_SCHEMA
Unexpected outbound database queries or spikes in MySQL error log entries referencing plugin tables
New or modified WordPress user accounts, options rows, or unexplained content changes following anomalous plugin traffic
Web server logs showing repeated parameter fuzzing against wp-admin/admin-ajax.php or plugin-specific routes

Detection Strategies

Deploy web application firewall (WAF) rules that flag SQL injection payloads targeting Quotes llama request parameters
Enable MySQL general query logging on staging environments to baseline legitimate plugin queries and alert on deviations
Correlate HTTP 500 responses from plugin endpoints with subsequent database read spikes to identify probing activity
Hunt for URI patterns and parameter values consistent with automated SQL injection scanners in access logs

Monitoring Recommendations

Forward WordPress, PHP-FPM, and MySQL logs to a centralized log platform for cross-source correlation
Alert on unauthenticated requests that trigger database errors originating from plugin code paths
Track plugin version inventory across managed WordPress sites to detect unpatched deployments
Monitor for post-exploitation behavior such as new administrative users, altered wp_options rows, or webshell uploads

How to Mitigate CVE-2026-56062

Immediate Actions Required

Identify all WordPress installations running Quotes llama and confirm plugin version status
Upgrade the plugin to a fixed version above 3.1.5 once released by the maintainer, or deactivate and remove it if no patch is available
Restrict access to WordPress admin and AJAX endpoints from untrusted networks via IP allowlisting or authentication proxies
Rotate database credentials and audit wp_users and wp_usermeta for unauthorized changes

Patch Information

Refer to the Patchstack advisory for Quotes llama for the authoritative patch status. Apply the vendor-provided fix as soon as it is available. Where a fixed release is not yet published, treat the plugin as vulnerable and remove it from production.

Workarounds

Disable and uninstall the Quotes llama plugin until a patched version is applied
Deploy WAF virtual patching rules that block SQL metacharacters in requests to plugin endpoints
Enforce least privilege on the WordPress database user by removing unnecessary FILE, CREATE, or administrative grants
Enable database activity monitoring to alert on unusual query patterns originating from the WordPress web tier

bash

# Configuration example - disable the vulnerable plugin via WP-CLI
wp plugin deactivate quotes-llama --all-network
wp plugin delete quotes-llama

# Restrict admin-ajax.php to authenticated sessions (nginx example)
location = /wp-admin/admin-ajax.php {
    limit_except POST { deny all; }
    allow 10.0.0.0/8;
    deny all;
}