CVE-2026-39746 in Booknetic Plugin
Summary
by MITRE • 10/06/2026
Unauthenticated SQL Injection in Booknetic <= 4.8.5 versions.
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Analysis
by VulDB Data Team • 10/06/2026
The vulnerability identified as an unauthenticated SQL injection flaw within Booknetic versions prior to or equal to 4.8.5 represents a critical security deficiency that allows remote attackers to execute arbitrary Structured Query Language commands against the underlying database without requiring valid credentials. This specific class of weakness is categorized under CWE-89, which defines Improper Neutralization of Special Elements used in an SQL Command, commonly known as SQL Injection. The root cause typically stems from insufficient input validation and sanitization mechanisms when processing user-supplied data within HTTP requests directed at the application's endpoints. In many WordPress plugin architectures like Booknetic, this often occurs during operations such as searching for bookings, filtering appointment lists, or retrieving customer details where dynamic queries are constructed by concatenating raw user inputs directly into SQL statements rather than utilizing parameterized queries or prepared statements.
From an operational perspective, the impact of this vulnerability is severe and multifaceted. An attacker can exploit this flaw to bypass authentication controls entirely, gaining unauthorized access to sensitive data stored in the database such as customer personal information, payment details, booking histories, and administrative credentials. Beyond simple data exfiltration, a skilled adversary may leverage SQL injection techniques like UNION-based attacks or blind boolean-based injections to extract schema information, modify existing records, delete critical data, or even execute system-level commands if the database configuration permits it through features such as xp_cmdshell in Microsoft SQL Server or similar extensions in other database management systems. This effectively compromises the integrity and confidentiality of the entire web application ecosystem dependent on that database instance.
The exploitation vector for this vulnerability aligns with ATT&CK technique T1190, which describes Exploit Public-Facing Application attacks where adversaries target vulnerabilities in internet-facing software to gain initial access or escalate privileges. Because the injection point is unauthenticated, it can be exploited remotely over a network without prior interaction from legitimate users, making it highly attractive for automated scanning tools and widespread exploitation campaigns. The lack of authentication requirement significantly lowers the barrier to entry for attackers, allowing even those with limited technical expertise to compromise systems hosting vulnerable instances of Booknetic by simply sending crafted HTTP requests containing malicious SQL payloads in query parameters or POST data fields.
Mitigation strategies must prioritize immediate remediation through software updates and defensive coding practices. The primary recommendation is to upgrade the Booknetic plugin to version 4.8.6 or later, where developers have implemented proper input sanitization and output encoding mechanisms that neutralize malicious SQL syntax before it reaches the database engine. For organizations unable to update immediately due to compatibility constraints, implementing a Web Application Firewall (WAF) with rules specifically tuned to detect common SQL injection patterns can provide an additional layer of defense by blocking suspicious requests at the network perimeter. Furthermore, developers should adhere to secure coding standards such as OWASP Top 10 guidelines, ensuring that all database interactions utilize prepared statements or stored procedures to separate code from data effectively. Regular security audits and penetration testing are also essential to identify similar vulnerabilities in other components of the application stack before they can be exploited by malicious actors seeking to compromise organizational assets.