CVE-2026-45218: WP Travel Plugin SQLi Vulnerability

CVE-2026-45218 Overview

CVE-2026-45218 is a Blind SQL Injection vulnerability in the WP Travel WordPress plugin affecting all versions through 11.4.0. The flaw stems from improper neutralization of special elements used in SQL commands [CWE-89]. Authenticated attackers with low privileges can send crafted requests over the network to manipulate backend database queries. The vulnerability has a scope-changed impact, meaning successful exploitation affects components beyond the vulnerable plugin itself. Confidentiality impact is high, allowing extraction of sensitive database contents through inference-based blind injection techniques.

Critical Impact
Authenticated attackers can extract sensitive database information from WordPress installations running WP Travel plugin versions up to and including 11.4.0 through blind SQL injection.

Affected Products

WP Travel plugin for WordPress, all versions up to and including 11.4.0
WordPress sites using WP Travel for booking and travel management
Any environment exposing WP Travel endpoints to authenticated users

Discovery Timeline

2026-05-12 - CVE-2026-45218 published to NVD
2026-05-12 - Last updated in NVD database

Technical Details for CVE-2026-45218

Vulnerability Analysis

The vulnerability is a Blind SQL Injection flaw classified under [CWE-89], Improper Neutralization of Special Elements used in an SQL Command. WP Travel fails to properly sanitize or parameterize user-supplied input before incorporating it into SQL queries executed against the WordPress database. Because the injection is blind, the application does not return query results directly to the attacker. Instead, attackers infer database contents through boolean-based or time-based payloads that alter application behavior or response timing.

The scope-changed designation indicates that exploitation impacts resources beyond the vulnerable component, which in WordPress contexts typically means the broader database containing user credentials, session tokens, and site configuration.

Root Cause

The root cause is the use of unsanitized user input in SQL statements within the WP Travel plugin code. Secure WordPress development requires using $wpdb->prepare() with placeholders for any user-controlled values. Where the plugin concatenates request parameters directly into query strings, attackers can break out of the intended query context and append arbitrary SQL clauses.

Attack Vector

Exploitation requires network access and low-privilege authentication to the WordPress instance. No user interaction is required. An attacker submits crafted parameters to a vulnerable WP Travel endpoint, embedding SQL syntax that the plugin passes through to the database. Through repeated requests with conditional payloads, the attacker extracts data one bit at a time. Refer to the Patchstack WordPress Vulnerability Advisory for technical details.

Detection Methods for CVE-2026-45218

Indicators of Compromise

Unusual sequences of HTTP requests to WP Travel plugin endpoints containing SQL keywords such as SLEEP, BENCHMARK, UNION, SELECT, OR 1=1, or encoded variants
Repeated authenticated requests from a single session with incrementing parameter values consistent with blind SQL extraction
Database query logs showing malformed or unusually long queries originating from WP Travel code paths
Spikes in response time variance for requests to specific plugin endpoints

Detection Strategies

Deploy a web application firewall with SQL injection signatures tuned for WordPress plugin parameters
Enable WordPress debug logging and MySQL slow query logging to capture suspicious query patterns
Correlate authenticated user activity with query anomalies to identify low-privilege accounts attempting injection
Monitor for outbound data exfiltration patterns following authentication events to WP Travel endpoints

Monitoring Recommendations

Track HTTP requests containing SQL metacharacters targeting /wp-admin/admin-ajax.php and WP Travel REST routes
Alert on time-based response anomalies that may indicate blind SQL injection probing
Review WordPress audit logs for newly created low-privilege accounts that subsequently access WP Travel features
Aggregate WAF, web server, and database telemetry into a central data lake for cross-source correlation

How to Mitigate CVE-2026-45218

Immediate Actions Required

Update WP Travel to a version newer than 11.4.0 as soon as a fixed release is available from the vendor
Audit existing WordPress user accounts and revoke unnecessary low-privilege access to the affected site
Review database and web server logs for evidence of prior exploitation attempts targeting WP Travel endpoints
Restrict access to WordPress login and registration pages where business requirements allow

Patch Information

Consult the Patchstack WordPress Vulnerability Advisory for the current patch status and remediation guidance. Apply vendor-supplied updates through the WordPress plugin management interface and verify the installed version exceeds 11.4.0.

Workarounds

Deploy virtual patching rules through a web application firewall to block SQL injection payloads targeting WP Travel parameters
Temporarily disable the WP Travel plugin if the site can operate without it until a patched version is installed
Enforce least privilege for WordPress user roles and disable open user registration where not required
Apply database-level controls limiting the WordPress database user to the minimum required permissions

bash

# Configuration example: WordPress CLI to disable the plugin until patched
wp plugin deactivate wp-travel
wp plugin status wp-travel