CVE-2026-52697: Taskbuilder SQL Injection Vulnerability

CVE-2026-52697 Overview

CVE-2026-52697 is a SQL injection vulnerability affecting the Taskbuilder WordPress plugin in versions up to and including 5.0.7. The flaw allows authenticated users holding the Subscriber role, the lowest privileged WordPress account type, to inject arbitrary SQL statements into backend database queries. The vulnerability is tracked under CWE-89: Improper Neutralization of Special Elements used in an SQL Command.

Critical Impact
Authenticated Subscriber-level attackers can extract sensitive database contents and pivot across plugin and WordPress core tables, with scope change indicating impact extends beyond the vulnerable component.

Affected Products

Taskbuilder WordPress plugin versions <= 5.0.7
WordPress sites with Taskbuilder installed and active
Sites permitting open Subscriber-level registration

Discovery Timeline

2026-06-15 - CVE-2026-52697 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-52697

Vulnerability Analysis

The Taskbuilder plugin fails to properly sanitize user-supplied input before incorporating it into SQL queries. An authenticated user with Subscriber privileges can submit crafted parameters to plugin endpoints, causing the malicious payload to be concatenated into a database statement. The injected SQL executes with the database privileges of the WordPress site, granting read access to wp_users, wp_usermeta, and other tables containing password hashes, session tokens, and plugin secrets.

The scope change component in the vector indicates that successful exploitation impacts resources outside the vulnerable plugin itself. The confidentiality impact is rated High, while availability impact is Low, reflecting that integrity controls remain intact but data exposure is comprehensive.

Root Cause

The root cause is missing parameterization in one or more database queries within Taskbuilder. User-controlled values reach SQL execution without being passed through $wpdb->prepare() or equivalent escaping routines. WordPress provides safe query APIs, but the plugin bypasses them by constructing queries through string concatenation.

Attack Vector

The attack is conducted over the network against the WordPress HTTP interface. An attacker first registers or compromises a Subscriber-level account, then issues authenticated requests to vulnerable plugin endpoints. Payloads typically use UNION SELECT or boolean-based blind techniques to exfiltrate data row by row. No user interaction beyond the attacker's own session is required.

For full technical reproduction details, see the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-52697

Indicators of Compromise

HTTP requests from authenticated Subscriber accounts containing SQL keywords such as UNION, SELECT, SLEEP, or 0x hex encoding in Taskbuilder parameters
Unexpected admin-ajax.php or REST API calls from low-privilege users targeting Taskbuilder action handlers
Database error messages in PHP logs referencing Taskbuilder query functions
Spikes in slow queries or extended response times consistent with time-based blind SQL injection

Detection Strategies

Inspect web server access logs for SQL metacharacters in query strings and POST bodies destined for Taskbuilder endpoints
Deploy WAF rules matching SQL injection signatures scoped to the plugin's URL paths
Correlate Subscriber-role authentication events with database query anomalies in application logs
Enable MySQL general query logging temporarily to identify malformed or suspicious queries originating from the WordPress process

Monitoring Recommendations

Alert on new Subscriber registrations followed within minutes by requests to plugin AJAX or REST endpoints
Monitor for outbound data transfers from the WordPress host that deviate from baseline
Track failed and successful logins to detect credential stuffing aimed at obtaining Subscriber access

How to Mitigate CVE-2026-52697

Immediate Actions Required

Update Taskbuilder to a version newer than 5.0.7 as soon as a patched release is published by the vendor
Audit the user list and remove unrecognized Subscriber accounts created during recent enumeration windows
Rotate WordPress administrator passwords, secret keys in wp-config.php, and any API tokens stored in the database
Review database logs for evidence of UNION-based or time-based extraction attempts

Patch Information

At the time of CVE publication, refer to the Patchstack Vulnerability Report for the latest fixed version and vendor advisory. Apply the vendor patch through the WordPress plugin updater once available.

Workarounds

Disable and remove the Taskbuilder plugin until a patched version is installed
Disable open user registration under Settings > General to prevent attackers from creating Subscriber accounts
Deploy a WAF rule set blocking SQL injection patterns on requests to Taskbuilder URL paths
Restrict access to admin-ajax.php and REST endpoints from untrusted networks where feasible

bash

# Temporarily disable the plugin via WP-CLI until a patch is applied
wp plugin deactivate taskbuilder

# Disable open registration to limit Subscriber account creation
wp option update users_can_register 0