CVE-2026-73355: Affiliates Manager SQLi Vulnerability

CVE-2026-73355 Overview

CVE-2026-73355 is an unauthenticated SQL injection vulnerability affecting the Affiliates Manager plugin for WordPress in versions 2.9.53 and earlier. The flaw allows remote attackers to inject arbitrary SQL statements without authentication, exploiting improper neutralization of user input in SQL commands [CWE-89]. The vulnerability carries a CVSS 3.1 score of 9.3 and is exploitable over the network with low complexity and no user interaction. Because attackers require no credentials, any WordPress site running an affected version of the plugin is exposed to remote database interaction attempts.

Critical Impact
Unauthenticated attackers can send crafted requests to inject SQL commands, potentially exposing sensitive database content and enabling further compromise of the WordPress installation.

Affected Products

WordPress Affiliates Manager plugin versions <= 2.9.53
WordPress sites with the plugin installed and active
Any hosting environment exposing the vulnerable plugin endpoints to the internet

Discovery Timeline

2026-08-18 - CVE-2026-73355 published to NVD
2026-08-20 - Last updated in NVD database

Technical Details for CVE-2026-73355

Vulnerability Analysis

The Affiliates Manager plugin fails to properly neutralize special elements used in SQL commands when processing user-supplied input. Attackers can inject SQL syntax through request parameters that reach database queries without adequate sanitization or parameterization. Because the vulnerable code path does not require authentication, an unauthenticated remote attacker can trigger the flaw directly.

Successful exploitation can enable attackers to read arbitrary rows from the WordPress database, including affiliate records, user metadata, and other tables accessible to the plugin's database user. The CVSS vector indicates a scope change, meaning the injection can affect resources beyond the vulnerable component's original security authority. Confidentiality impact is high while integrity is not directly impacted, consistent with information disclosure through injection rather than arbitrary data modification.

Root Cause

The root cause is improper input validation and construction of SQL queries using concatenated user-controlled input [CWE-89]. The plugin does not consistently apply prepared statements or WordPress's $wpdb->prepare() API for the affected query paths.

Attack Vector

Exploitation occurs over the network by sending crafted HTTP requests to plugin endpoints that reach the vulnerable SQL query. No authentication, privileges, or user interaction is required. The attacker manipulates request parameters to break out of the intended SQL context and append or modify query logic. Refer to the Patchstack SQL Injection Analysis for technical details on the vulnerable code path.

Detection Methods for CVE-2026-73355

Indicators of Compromise

Web server access logs showing requests to Affiliates Manager endpoints containing SQL keywords such as UNION, SELECT, SLEEP, INFORMATION_SCHEMA, or encoded variants
Unusual database query errors correlated with plugin request URIs in PHP or MySQL logs
Unexpected outbound queries or data volume from the WordPress database process
New or modified administrator accounts, or unexpected reads of the wp_users and wp_usermeta tables

Detection Strategies

Deploy WAF rules that inspect query strings and POST bodies for SQL injection patterns targeting plugin endpoints
Enable WordPress debug logging and MySQL general query logging temporarily to identify malformed or injected queries
Baseline normal request patterns to Affiliates Manager endpoints and alert on anomalous parameter content or request frequency

Monitoring Recommendations

Forward web server, PHP, and database logs to a centralized analytics platform for correlation across the request-to-query chain
Alert on high-volume requests to plugin URIs from single source IPs, which may indicate automated exploitation attempts
Monitor the WordPress plugin directory for unexpected file changes that may follow post-exploitation web shell deployment

How to Mitigate CVE-2026-73355

Immediate Actions Required

Update the Affiliates Manager plugin to a version above 2.9.53 as soon as a patched release is available from the vendor
If no fixed version is available, deactivate and remove the plugin from all affected WordPress sites
Audit the WordPress database for signs of unauthorized read access, especially against wp_users, wp_usermeta, and affiliate tables
Rotate WordPress administrator passwords and any secrets stored in the database if compromise is suspected

Patch Information

Consult the Patchstack SQL Injection Analysis for the latest patch status and remediation guidance. Apply the vendor-provided fix promptly once released and verify the plugin version after updating.

Workarounds

Deploy a Web Application Firewall with SQL injection signatures in front of the WordPress site to block exploitation attempts
Restrict access to Affiliates Manager endpoints via IP allowlists or authentication proxies where feasible
Apply the principle of least privilege to the WordPress database user, limiting access to only required tables

bash

# Example: disable the vulnerable plugin via WP-CLI until a patched version is installed
wp plugin deactivate affiliates-manager
wp plugin delete affiliates-manager