CVE-2026-9711 Overview
CVE-2026-9711 is a SQL injection vulnerability in the EventON - WordPress Virtual Event Calendar Plugin (full version) affecting versions up to and including 5.0.11. The flaw resides in the handling of the WordPress search parameter, which is neither properly escaped nor passed through a prepared statement. Unauthenticated attackers can append arbitrary SQL clauses to existing queries and exfiltrate database contents. Exploitation requires the "Enable additional search queries" setting to be active and at least one published event. The issue is tracked under CWE-89.
Critical Impact
Unauthenticated remote attackers can extract sensitive data, including user credentials and session tokens, from the WordPress database over the network.
Affected Products
- EventON - WordPress Virtual Event Calendar Plugin (full) versions <= 5.0.11
- WordPress sites with the "Enable additional search queries" setting enabled
- WordPress installations containing at least one published event
Discovery Timeline
- 2026-06-30 - CVE-2026-9711 published to NVD
- 2026-06-30 - Last updated in NVD database
Technical Details for CVE-2026-9711
Vulnerability Analysis
The EventON plugin exposes a search feature that accepts a user-supplied search parameter through WordPress. The plugin concatenates this input directly into an SQL query without invoking $wpdb->prepare() or applying esc_sql() sanitization. Attackers can therefore break out of the intended query context and append UNION SELECT statements or subqueries.
Because the endpoint requires no authentication, any anonymous visitor can send crafted requests. Successful injection yields read access to the WordPress database, including the wp_users table containing password hashes and session metadata. The vulnerability aligns with CWE-89: Improper Neutralization of Special Elements used in an SQL Command.
Root Cause
The root cause is insufficient escaping of the search parameter combined with the absence of a prepared statement. The plugin trusts the incoming string and interpolates it directly into a query targeting event data. This design pattern violates the WordPress database API guidance, which requires all dynamic values to pass through $wpdb->prepare().
Attack Vector
Attackers send an HTTP request to a vulnerable EventON search endpoint with a malicious search value. The payload closes the original string, injects an additional query, and comments out trailing SQL. Because exploitation is unauthenticated and network-based, it can be automated at scale against exposed WordPress installations. The Wordfence advisory documents the exploitation preconditions and payload structure. Additional details are available in the Wordfence Vulnerability Report and on the MyEventon Official Site.
Detection Methods for CVE-2026-9711
Indicators of Compromise
- HTTP requests containing SQL metacharacters such as ', UNION, SELECT, or -- in the search query parameter targeting EventON endpoints.
- Unusual outbound database query patterns from the WordPress host, including large SELECT statements against wp_users or wp_options.
- Web server access logs showing repeated requests to event search URLs from a single source IP.
Detection Strategies
- Deploy web application firewall rules that flag SQL keywords and tautology patterns in the search parameter.
- Enable MySQL general query logging temporarily to capture anomalous queries originating from the EventON plugin code path.
- Correlate WordPress access logs with database error logs to surface failed injection attempts that trigger syntax errors.
Monitoring Recommendations
- Alert on HTTP 500 responses from EventON search endpoints, which often accompany malformed injection payloads.
- Monitor for new administrator accounts, unexpected password resets, or exported user tables following suspicious search activity.
- Track EPSS movement for CVE-2026-9711, currently 0.438%, as an indicator of emerging exploitation interest.
How to Mitigate CVE-2026-9711
Immediate Actions Required
- Update the EventON plugin to a version later than 5.0.11 as soon as the vendor releases a patched build.
- Disable the "Enable additional search queries" setting in the EventON configuration to remove the exploitation precondition.
- Audit the WordPress database for signs of unauthorized data access, including anomalous reads on wp_users.
Patch Information
No fixed version is listed in the NVD entry for CVE-2026-9711 at publication time. Site operators should monitor the MyEventon Official Site and the Wordfence Vulnerability Report for the patched release and apply it immediately when available.
Workarounds
- Toggle the "Enable additional search queries" option off in the EventON plugin settings until a fix is installed.
- Restrict access to WordPress search endpoints behind an authenticated reverse proxy or IP allowlist where feasible.
- Deploy a WAF signature that blocks SQL injection patterns targeting the search parameter on EventON URLs.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
