CVE-2025-39355: FAT Services Booking SQLi Vulnerability

CVE-2025-39355 Overview

CVE-2025-39355 is a SQL Injection vulnerability in the roninwp FAT Services Booking WordPress plugin. The flaw stems from improper neutralization of special elements used in an SQL command [CWE-89]. Attackers with low-privilege authenticated access can inject malicious SQL statements through the plugin. The vulnerability affects all versions of FAT Services Booking up to and including 5.6. Successful exploitation grants attackers unauthorized read access to the WordPress database and can extend impact beyond the vulnerable component due to the changed scope.

Critical Impact
Authenticated attackers can extract sensitive database contents, including user credentials, session data, and confidential customer booking information stored by the plugin.

Affected Products

roninwp FAT Services Booking plugin for WordPress
All versions from n/a through 5.6
WordPress installations running the fat-services-booking plugin

Discovery Timeline

2025-05-19 - CVE-2025-39355 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-39355

Vulnerability Analysis

The FAT Services Booking plugin fails to properly sanitize user-supplied input before incorporating it into SQL queries. This classification falls under [CWE-89], Improper Neutralization of Special Elements used in an SQL Command. The vulnerability is exploitable over the network and requires only low-level authentication with no user interaction. The scope is changed, meaning exploitation can affect resources beyond the vulnerable plugin itself. Confidentiality impact is high, while availability impact is limited and integrity is unaffected according to the published CVSS metrics.

Root Cause

The root cause is the absence of prepared statements or parameterized queries when handling user-controlled data. Input passed to plugin endpoints reaches SQL query construction without being escaped through $wpdb->prepare() or equivalent sanitization functions. This allows special characters such as single quotes, semicolons, and SQL keywords to alter query logic.

Attack Vector

An authenticated attacker with at least Subscriber or Contributor level privileges submits crafted input to a vulnerable plugin endpoint. The malicious payload is concatenated into a backend SQL query and executed against the WordPress database. Depending on the injection point, the attacker can perform UNION-based extraction, boolean-based blind inference, or time-based blind attacks to enumerate database contents. Refer to the Patchstack SQL Injection Vulnerability advisory for technical details.

Detection Methods for CVE-2025-39355

Indicators of Compromise

Unusual SQL syntax patterns such as UNION SELECT, SLEEP(, BENCHMARK(, or encoded quotes in HTTP request parameters targeting fat-services-booking endpoints.
Unexpected outbound queries or spikes in database read volume originating from the plugin's PHP handlers.
WordPress access log entries containing suspicious query strings directed at plugin AJAX or REST routes.

Detection Strategies

Deploy web application firewall rules that inspect requests to /wp-admin/admin-ajax.php and plugin-specific endpoints for SQL metacharacters and injection signatures.
Enable MySQL general query logging temporarily to correlate anomalous queries with plugin activity.
Review WordPress audit logs for authenticated users submitting malformed booking-related parameters.

Monitoring Recommendations

Baseline normal plugin query patterns and alert on deviations such as boolean tautologies or stacked queries.
Monitor low-privilege accounts for behavior consistent with database enumeration or credential dumping.
Track database error rates from the WordPress backend, since blind SQL injection often triggers syntax errors during payload tuning.

How to Mitigate CVE-2025-39355

Immediate Actions Required

Update FAT Services Booking to a version later than 5.6 as soon as the vendor publishes a fixed release.
Restrict registration and lower privileged account creation on WordPress instances running the plugin until patched.
Audit existing user accounts and rotate WordPress and database credentials if exploitation is suspected.

Patch Information

At the time of publication, no fixed version beyond 5.6 is confirmed in the referenced advisory. Administrators should monitor the Patchstack advisory for FAT Services Booking and the plugin's WordPress repository page for an updated release addressing CVE-2025-39355.

Workarounds

Deactivate and remove the fat-services-booking plugin until a patched version is available.
Deploy virtual patching through a WordPress-aware WAF such as Patchstack, Wordfence, or an equivalent to block SQL injection payloads.
Enforce least-privilege on WordPress roles and disable open user registration to reduce the pool of accounts capable of exploiting the flaw.

bash

# Configuration example: disable the plugin via WP-CLI as a temporary mitigation
wp plugin deactivate fat-services-booking
wp plugin delete fat-services-booking