CVE-2025-31534: Shopper Plugin SQL Injection Vulnerability

CVE-2025-31534 Overview

CVE-2025-31534 is a SQL Injection vulnerability affecting the Shopper WordPress plugin developed by shopperdotcom. The flaw exists in all plugin versions up to and including 3.2.5. The vulnerability stems from improper neutralization of special elements used in an SQL command [CWE-89], allowing unauthenticated attackers to inject malicious SQL statements through unsanitized input. Successful exploitation enables attackers to read database contents and potentially disrupt service availability across affected WordPress sites.

Critical Impact

Unauthenticated remote attackers can execute arbitrary SQL queries against the WordPress database, exposing sensitive data and impacting site availability.

Affected Products

• shopperdotcom Shopper WordPress plugin versions through 3.2.5
• WordPress installations with the Shopper plugin enabled
• E-commerce sites relying on Shopper for storefront functionality

Discovery Timeline

• 2025-04-01 - CVE CVE-2025-31534 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-31534

Vulnerability Analysis

The vulnerability resides in the Shopper plugin's handling of user-supplied input passed to SQL queries. The plugin fails to properly sanitize or parameterize input before incorporating it into database queries. This deficiency permits attackers to break out of the intended query context and append arbitrary SQL syntax.

An unauthenticated attacker can issue crafted HTTP requests over the network with no user interaction required. The scope of the vulnerability is changed, meaning exploitation can affect resources beyond the vulnerable component itself.

The EPSS probability is 0.148% with a percentile of 34.899, indicating limited observed exploitation activity at this time. No public proof-of-concept exploit or CISA KEV listing has been confirmed.

Root Cause

The root cause is improper neutralization of special elements in SQL commands [CWE-89]. The plugin concatenates untrusted input directly into SQL statements without prepared statements or escape routines. Special characters such as single quotes, semicolons, and comment sequences pass through untouched, allowing query structure manipulation.

Attack Vector

The attack vector is network-based and requires no authentication or privileges. An attacker sends an HTTP request containing SQL metacharacters to a vulnerable plugin endpoint. The malicious payload is concatenated into a backend query, causing the database to execute attacker-controlled statements. Attackers can enumerate database schemas, extract WordPress administrator credentials, and exfiltrate customer or order data.

No verified exploitation code is publicly available. See the PatchStack WordPress Vulnerability advisory for technical details.

Detection Methods for CVE-2025-31534

Indicators of Compromise

• HTTP requests containing SQL metacharacters such as UNION SELECT, OR 1=1, --, or '; targeting Shopper plugin endpoints
• Unexpected outbound database errors or stack traces returned in HTTP responses from /wp-content/plugins/shopper/ paths
• Anomalous database query patterns including long-running queries or unusual information_schema access from the web user
• New or modified WordPress administrator accounts following suspicious request bursts

Detection Strategies

• Inspect web server access logs for query strings containing SQL injection signatures targeting Shopper plugin parameters
• Enable WordPress database query logging and alert on queries referencing wp_users or wp_usermeta originating from plugin code paths
• Deploy a Web Application Firewall (WAF) with SQL injection rule sets tuned for WordPress plugin parameters

Monitoring Recommendations

• Monitor authentication logs for unexpected administrator logins after suspicious HTTP traffic
• Track plugin file integrity to detect post-exploitation webshell uploads or file modifications
• Alert on unusual data egress volumes from the WordPress host that may indicate database exfiltration

How to Mitigate CVE-2025-31534

Immediate Actions Required

• Disable the Shopper plugin until a patched version is installed if no fixed release is available
• Restrict access to the WordPress site using IP allowlists or authentication proxies during remediation
• Rotate all WordPress administrator passwords and database credentials if compromise is suspected
• Review WordPress user tables for unauthorized accounts and remove any unrecognized entries

Patch Information

As of the last NVD update on 2026-04-23, the vulnerability affects Shopper versions through 3.2.5. Refer to the PatchStack advisory for the latest vendor patch availability and upgrade guidance.

Workarounds

• Deploy a Web Application Firewall with SQL injection signatures in front of the WordPress site
• Apply database principle of least privilege by restricting the WordPress database user to required tables and operations only
• Enable WordPress hardening rules to block requests containing common SQL injection payloads at the web server layer

# Example WAF rule to block common SQLi patterns targeting Shopper plugin endpoints
SecRule REQUEST_URI "@contains /wp-content/plugins/shopper/" \
    "chain,deny,status:403,id:1003153,msg:'Block SQLi in Shopper plugin'"
    SecRule ARGS "@rx (?i)(union(\s|\+)+select|or(\s|\+)+1=1|--|;--|';)" "t:none"