CVE-2025-49891: Uxper Booking SQL Injection Vulnerability

CVE-2025-49891 Overview

CVE-2025-49891 is a blind SQL injection vulnerability in the Uxper Booking WordPress plugin developed by uxper. The flaw affects all plugin versions up to and including 1.3.3. The vulnerability stems from improper neutralization of special elements in SQL commands, tracked as [CWE-89]. Authenticated attackers with low privileges can inject arbitrary SQL statements over the network. Successful exploitation exposes sensitive database contents and can affect neighboring components due to the scope-change condition in the CVSS vector.

Critical Impact

Authenticated attackers can extract sensitive data from the WordPress database through blind SQL injection, with impact extending beyond the vulnerable plugin's security scope.

Affected Products

• Uxper Booking WordPress plugin versions through 1.3.3
• WordPress sites running the uxper-booking plugin
• Any environment where the plugin processes authenticated user input

Discovery Timeline

• 2025-08-20 - CVE-2025-49891 published to NVD
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-49891

Vulnerability Analysis

The Uxper Booking plugin fails to properly sanitize user-supplied input before incorporating it into SQL queries. Because the injection is blind, attackers cannot see query results directly in HTTP responses. Instead, they infer database contents through boolean-based or time-based inference techniques.

The vulnerability requires low-privileged authentication, which lowers the barrier for exploitation in multi-user WordPress environments. Sites that allow customer registration or subscriber accounts expose the attack surface to any registered user. The scope-change condition indicates that successful exploitation can affect resources beyond the plugin's security boundary, including the broader WordPress database.

Root Cause

The root cause is improper neutralization of special elements used in SQL commands [CWE-89]. The plugin concatenates user input into SQL queries without using prepared statements or parameterized queries. WordPress provides $wpdb->prepare() for safe query construction, but the vulnerable plugin code paths bypass this protection.

Attack Vector

An authenticated attacker sends crafted HTTP requests containing SQL metacharacters to vulnerable plugin endpoints. The malicious payload manipulates the backend query logic to extract data from tables such as wp_users and wp_usermeta. Blind injection techniques include:

• Boolean-based inference using conditional expressions that alter response behavior
• Time-based inference using SLEEP() or BENCHMARK() functions to measure response delays
• Extraction of password hashes, session tokens, and personally identifiable information stored in the database

Refer to the Patchstack SQL Injection Vulnerability advisory for additional technical context.

Detection Methods for CVE-2025-49891

Indicators of Compromise

• HTTP requests to Uxper Booking plugin endpoints containing SQL metacharacters such as ', --, UNION, or SLEEP(
• Unusual database query latency correlating with authenticated user activity
• Unexpected outbound data flows or bulk reads against wp_users and wp_usermeta tables
• Web server access logs showing repetitive parametric requests from the same authenticated session

Detection Strategies

• Deploy a Web Application Firewall (WAF) rule set that flags SQL injection patterns targeting /wp-admin/admin-ajax.php and plugin routes
• Enable WordPress query logging and correlate slow queries with authenticated user IDs
• Monitor MySQL general query logs for anomalous UNION SELECT, INFORMATION_SCHEMA access, or timing functions from plugin-related requests

Monitoring Recommendations

• Alert on authenticated low-privilege accounts issuing requests that trigger WAF SQL injection signatures
• Baseline normal request rates to booking endpoints and alert on deviations
• Review WordPress user registration logs for newly created accounts followed by suspicious plugin interactions

How to Mitigate CVE-2025-49891

Immediate Actions Required

• Identify all WordPress installations running the Uxper Booking plugin version 1.3.3 or earlier
• Restrict registration of new low-privilege user accounts until a patched version is deployed
• Rotate credentials and session tokens if compromise is suspected, and review database audit logs
• Apply WAF signatures blocking SQL injection payloads targeting the plugin's endpoints

Patch Information

At the time of publication, refer to the Patchstack advisory for the latest patch availability. Administrators should upgrade to a version above 1.3.3 once the vendor releases a fix. Subscribe to vendor and Patchstack notifications to receive patch release announcements.

Workarounds

• Disable the Uxper Booking plugin until a patched version becomes available
• Deploy a virtual patch through a WAF such as Patchstack, Wordfence, or ModSecurity with rules blocking SQL injection payloads on plugin routes
• Enforce least privilege for WordPress accounts and remove unnecessary low-privileged users
• Restrict access to booking functionality using IP allowlists where feasible

# Example ModSecurity rule blocking common SQL injection payloads to the plugin
SecRule REQUEST_URI "@contains uxper-booking" \
  "phase:2,deny,status:403,id:1004991,\
  chain,msg:'Block SQLi attempt on Uxper Booking'"
  SecRule ARGS "@rx (?i)(union(\s|/\*.*\*/)+select|sleep\s*\(|benchmark\s*\(|--\s|/\*)" "t:none,t:urlDecode"