CVE-2026-40762 Overview
CVE-2026-40762 is an unauthenticated SQL injection vulnerability affecting the WPGraphQL plugin for WordPress in versions prior to 2.11.1. The flaw is classified under CWE-89, Improper Neutralization of Special Elements used in an SQL Command. Attackers can submit crafted GraphQL queries over the network without authentication. The issue carries a CVSS 3.1 score of 7.5 and an EPSS probability of 0.251% as of 2026-06-18.
Critical Impact
Unauthenticated attackers can inject SQL through WPGraphQL queries, exposing confidential database contents and degrading WordPress availability.
Affected Products
- WPGraphQL plugin for WordPress versions prior to 2.11.1
- WordPress installations exposing the WPGraphQL endpoint
- Sites using WPGraphQL with default network-accessible GraphQL routes
Discovery Timeline
- 2026-06-15 - CVE-2026-40762 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
- 2026-06-18 - EPSS score recorded at 0.251% (percentile 16.16)
Technical Details for CVE-2026-40762
Vulnerability Analysis
WPGraphQL exposes a GraphQL API endpoint on WordPress sites, translating GraphQL queries into SQL operations against the underlying database. Versions prior to 2.11.1 fail to properly neutralize user-supplied input before incorporating it into SQL statements. This deficiency allows an unauthenticated attacker to influence query construction by sending crafted GraphQL requests. The vulnerability falls under [CWE-89] SQL Injection.
The published CVSS vector indicates a network attack vector with no privileges and no user interaction required, and a scope change with high confidentiality impact and low availability impact. High attack complexity reflects conditions an attacker must satisfy to reliably craft an injection payload through the GraphQL parser. Successful exploitation can disclose sensitive database contents including credentials, session tokens, post metadata, and configuration values stored in WordPress tables.
Root Cause
The root cause is insufficient input sanitization and missing parameterization when GraphQL field arguments are translated into SQL WHERE, ORDER BY, or filter clauses. When user-controlled values reach the SQL layer without prepared statement binding, attackers can break out of the intended query context. The Patchstack advisory confirms the issue is resolved in version 2.11.1.
Attack Vector
Attackers send crafted HTTP POST requests to the /graphql endpoint exposed by the plugin. The requests embed malicious payloads inside GraphQL query arguments that are reflected into backend SQL. No authentication, account, or user interaction is required. The vulnerability mechanism is described in the Patchstack WordPress Vulnerability advisory; no public proof-of-concept code was available at publication.
Detection Methods for CVE-2026-40762
Indicators of Compromise
- Unusual POST requests to the /graphql endpoint containing SQL syntax such as UNION, SELECT, SLEEP(, or comment sequences like -- and /*
- Unexpected GraphQL queries originating from unauthenticated sessions or anonymous IP addresses
- Database error messages or abnormal response sizes returned from WPGraphQL queries
- Spikes in query latency consistent with time-based SQL injection probing
Detection Strategies
- Inspect web server access logs for high-volume or malformed requests targeting /graphql and ?graphql routes
- Deploy a Web Application Firewall (WAF) rule set with SQL injection signatures applied to GraphQL request bodies
- Audit the installed WPGraphQL plugin version against the patched release 2.11.1
- Correlate WordPress database error logs with GraphQL request timestamps to identify probing
Monitoring Recommendations
- Forward WordPress, WAF, and reverse proxy logs to a centralized SIEM for query-pattern analytics
- Alert on GraphQL requests containing SQL keywords from unauthenticated source IPs
- Track outbound data volume from WordPress hosts to detect bulk database exfiltration
- Monitor MySQL or MariaDB slow query logs for anomalous query shapes originating from the WordPress user
How to Mitigate CVE-2026-40762
Immediate Actions Required
- Upgrade WPGraphQL to version 2.11.1 or later on all WordPress sites
- Audit GraphQL endpoint exposure and restrict it to trusted networks where feasible
- Review recent access logs for signs of exploitation prior to patching
- Rotate WordPress administrator credentials and API secrets if compromise is suspected
Patch Information
The vendor addressed CVE-2026-40762 in WPGraphQL version 2.11.1. Patch details and references are documented in the Patchstack advisory. Apply the update through the WordPress plugin manager or via WP-CLI to ensure all sites in a multisite deployment are remediated.
Workarounds
- Disable the WPGraphQL plugin until the patched version can be installed
- Restrict access to the /graphql endpoint using WAF rules or reverse proxy ACLs
- Apply virtual patching by blocking GraphQL request bodies containing SQL metacharacters
- Enforce least-privilege database credentials for WordPress to limit injection blast radius
# Configuration example: update WPGraphQL via WP-CLI
wp plugin update wp-graphql --version=2.11.1
wp plugin list --name=wp-graphql --fields=name,status,version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
