CVE-2025-47537: PDF Invoice Builder WooCommerce SQLi Flaw

CVE-2025-47537 Overview

CVE-2025-47537 is a SQL Injection vulnerability in the add-ons.org PDF Invoice Builder for WooCommerce WordPress plugin (pdf-for-woocommerce). The flaw stems from improper neutralization of special elements used in SQL commands [CWE-89]. It affects all plugin versions from initial release through 5.3.8. An authenticated attacker with high privileges can inject arbitrary SQL statements into backend database queries. Successful exploitation can expose sensitive WooCommerce order data and degrade availability of the WordPress site.

Critical Impact
An authenticated attacker can execute arbitrary SQL queries against the WordPress database, leading to confidentiality loss across order, customer, and invoice data and partial availability impact on the host site.

Affected Products

add-ons.org PDF Invoice Builder for WooCommerce (pdf-for-woocommerce)
All versions from initial release up to and including 5.3.8
WordPress sites running WooCommerce with the affected plugin enabled

Discovery Timeline

2025-05-07 - CVE-2025-47537 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-47537

Vulnerability Analysis

The plugin builds SQL queries by concatenating user-controllable input into statements without parameterization or proper escaping. When a privileged user submits crafted input through an affected plugin endpoint, the database executes attacker-supplied SQL fragments. The scope changes during exploitation, meaning the injected query can reach data outside the plugin's own tables. Confidentiality impact is high because the WordPress database holds customer addresses, order details, and invoice metadata. Availability impact is limited, but malformed queries can lock tables or trigger errors that disrupt invoice generation.

Root Cause

The root cause is missing input sanitization on parameters used to construct SQL queries in the PDF Invoice Builder for WooCommerce plugin. The code path does not use prepared statements via $wpdb->prepare() or apply esc_sql() to dynamic values. Special characters such as single quotes, comments, and UNION keywords pass through unfiltered, allowing the database engine to parse them as syntax rather than literal data.

Attack Vector

The attack vector is network-based over HTTP or HTTPS to the WordPress administrative interface. The attacker must hold high-privilege credentials, typically shop manager or administrator. No user interaction is required beyond the attacker's own request. The attacker injects SQL payloads into a vulnerable plugin parameter and observes responses or side effects to extract data using boolean, time-based, or UNION-based techniques.

No verified public proof-of-concept code is available. Refer to the Patchstack advisory for additional technical context.

Detection Methods for CVE-2025-47537

Indicators of Compromise

Unexpected WordPress requests to pdf-for-woocommerce admin-ajax or REST endpoints containing SQL metacharacters such as ', --, UNION, or SLEEP(.
Database error entries in WordPress debug.log referencing plugin functions and malformed SQL syntax.
Anomalous SELECT queries against wp_users, wp_usermeta, or wp_woocommerce_* tables originating from plugin code paths.
Outbound data transfers correlating with administrative sessions of shop manager or administrator accounts.

Detection Strategies

Inspect web server access logs for requests to plugin endpoints containing URL-encoded SQL syntax (%27, %20UNION%20, %3B--).
Enable MySQL or MariaDB general query logging during investigation to capture concatenated query fragments.
Deploy a web application firewall ruleset targeting SQL injection signatures on WordPress admin paths.
Audit authenticated user activity for high-privilege accounts accessing PDF invoice features at unusual times.

Monitoring Recommendations

Forward WordPress, web server, and database logs to a centralized SIEM with OCSF normalization for cross-source correlation.
Alert on repeated wpdb errors emitted by the affected plugin file paths.
Track creation of new administrator accounts or modifications to wp_users following plugin endpoint access.
Monitor outbound HTTP traffic from the WordPress host for large response payloads tied to admin sessions.

How to Mitigate CVE-2025-47537

Immediate Actions Required

Update the PDF Invoice Builder for WooCommerce plugin to a version later than 5.3.8 as soon as the vendor releases a fix.
Restrict access to WordPress administrative endpoints by IP allowlisting where feasible.
Rotate credentials for all shop manager and administrator accounts and enforce multi-factor authentication.
Review database audit logs and WordPress activity for signs of prior exploitation.

Patch Information

The vendor advisory tracked by Patchstack indicates the issue affects versions through 5.3.8. Review the Patchstack advisory for the fixed version reference and upgrade guidance. Apply the patched release through the WordPress plugin manager or via WP-CLI.

Workarounds

Disable and remove the pdf-for-woocommerce plugin until a patched version is installed.
Deploy WAF rules that block SQL injection payloads targeting the plugin's admin-ajax and REST routes.
Reduce the number of accounts with shop manager or administrator privileges to minimize the attack surface.
Use a least-privilege database account for WordPress that lacks FILE, CREATE USER, and cross-database SELECT permissions.

bash

# Configuration example: update the plugin via WP-CLI and audit privileged users
wp plugin update pdf-for-woocommerce
wp plugin status pdf-for-woocommerce
wp user list --role=administrator --fields=ID,user_login,user_email,user_registered
wp user list --role=shop_manager --fields=ID,user_login,user_email,user_registered