CVE-2026-15651 Overview
CVE-2026-15651 is an authenticated SQL injection vulnerability in the WP TripAdvisor Review Slider plugin for WordPress. The flaw affects all versions up to and including 14.6 and stems from insufficient escaping of the filtersource parameter combined with inadequate SQL query preparation. Attackers with administrator-level access can append additional SQL queries to existing statements and extract sensitive data from the WordPress database. The vulnerability is tracked under [CWE-89] (Improper Neutralization of Special Elements used in an SQL Command).
Critical Impact
Authenticated administrators can execute arbitrary SQL queries against the WordPress database, enabling extraction of user credentials, session tokens, and other sensitive information stored in wp_users, wp_usermeta, and custom tables.
Affected Products
- WP TripAdvisor Review Slider plugin for WordPress — all versions through 14.6
- WordPress sites with the plugin installed and active
- Any hosting environment running vulnerable installations of the plugin
Discovery Timeline
- 2026-07-16 - CVE-2026-15651 published to NVD
- 2026-07-16 - Last updated in NVD database
Technical Details for CVE-2026-15651
Vulnerability Analysis
The WP TripAdvisor Review Slider plugin accepts a filtersource parameter that flows into SQL queries without proper sanitization or parameterized query preparation. The affected code paths exist in both the administrative interface (admin/class-wp-tripadvisor-review-slider-admin.php) and public display components (public/partials/wp-tripadvisor-review-slider-public-display.php and wp-tripadvisor-review-slider-public-display-widget.php).
Because the parameter value concatenates directly into SQL statements, attackers can inject additional SQL clauses using standard injection techniques such as UNION SELECT payloads or stacked query fragments. Successful exploitation returns data from arbitrary tables in the response context of the vulnerable endpoint.
The vulnerability requires authenticated access at the administrator role or higher, which limits the attacker population but does not eliminate risk. Compromised administrator credentials, malicious insiders, and privilege escalation chains from other plugins all provide viable paths to exploitation.
Root Cause
The root cause is a failure to use WordPress database abstraction layer safeguards. The plugin does not wrap the filtersource value with esc_sql() or use $wpdb->prepare() with proper placeholders before including it in query strings. This leaves the query grammar open to attacker-controlled content.
Attack Vector
An authenticated administrator sends a crafted request containing SQL syntax in the filtersource parameter to any of the affected endpoints. The malicious payload is appended to the existing SQL query, causing the database to execute the attacker's additional clauses. Results can be exfiltrated through the plugin's response body or inferred through blind injection techniques.
No verified public exploit code is available for CVE-2026-15651 at the time of publication. See the Wordfence Vulnerability Analysis and the WordPress Plugin Code Review for the vulnerable code paths.
Detection Methods for CVE-2026-15651
Indicators of Compromise
- HTTP requests to WP TripAdvisor Review Slider endpoints containing SQL keywords such as UNION, SELECT, SLEEP, or INFORMATION_SCHEMA in the filtersource parameter
- Unexpected database read patterns against wp_users or wp_usermeta originating from the plugin's PHP files
- Anomalous administrator sessions issuing repeated parameterized requests to plugin display endpoints
Detection Strategies
- Enable WordPress query logging and inspect queries generated by class-wp-tripadvisor-review-slider-admin.php for concatenated user input
- Deploy WAF rules that inspect the filtersource parameter for SQL metacharacters and known injection payload patterns
- Correlate administrator authentication events with subsequent requests to plugin endpoints to identify abnormal access sequences
Monitoring Recommendations
- Forward web server access logs and WordPress audit logs to a centralized platform for retention and query
- Alert on outbound database errors returned in HTTP responses containing the string filtersource
- Monitor administrator account activity for privilege changes, new user creation, or bulk data export following plugin usage
How to Mitigate CVE-2026-15651
Immediate Actions Required
- Update the WP TripAdvisor Review Slider plugin to a version later than 14.6 as soon as the vendor releases a fixed release
- Audit WordPress administrator accounts and enforce multi-factor authentication on all privileged users
- Review recent database access logs for evidence of injection attempts against the filtersource parameter
Patch Information
The plugin maintainer published a code change in the WordPress Plugin Changeset Update addressing the affected files. Site operators should install any plugin release incorporating this changeset and verify the update via the WordPress admin dashboard.
Workarounds
- Deactivate and remove the WP TripAdvisor Review Slider plugin until a patched release is deployed
- Restrict administrator access to trusted IP ranges using web server or WAF controls to reduce the exploitable attack surface
- Apply virtual patching through a WAF rule that blocks SQL metacharacters in the filtersource request parameter
# Example ModSecurity rule to block SQL metacharacters in filtersource parameter
SecRule ARGS:filtersource "@rx (?i)(union|select|sleep|benchmark|information_schema|--|;)" \
"id:1026156510,phase:2,deny,status:403,msg:'CVE-2026-15651 SQLi attempt in filtersource'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
