CVE-2026-96822 in Books Gallery Plugin
Summary
by MITRE • 09/30/2026
Unauthenticated SQL Injection in Books Gallery <= 4.8.3 versions.
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Analysis
by VulDB Data Team • 09/30/2026
The vulnerability identified as an unauthenticated SQL injection flaw within the Books Gallery plugin, specifically affecting versions up to and including 4.8.3, represents a critical security deficiency that allows attackers to interact directly with the application's underlying database without requiring valid credentials or prior authentication. This type of vulnerability typically arises when user-supplied input is incorporated into an SQL query constructed via string concatenation or improper parameterization, failing to adequately sanitize or escape special characters such as single quotes, double quotes, and semicolons. In the context of a WordPress plugin like Books Gallery, which manages book metadata, categories, authors, and potentially sales data, this flaw provides a direct pathway for unauthorized access to sensitive information stored in the database backend.
From a technical perspective, the root cause lies in the insufficient validation of input parameters passed through HTTP requests, likely via GET or POST methods targeting specific endpoints within the plugin's functionality. When these inputs are embedded into SQL statements without proper escaping using functions such as mysqli_real_escape_string or prepared statements with bound parameters, an attacker can inject malicious SQL code that alters the logic of the original query. This manipulation enables techniques such as UNION-based injection to extract data from other tables, error-based injection to reveal database structure and version information, or blind boolean/time-based injections for extracting data character by character when direct output is not visible in the response body. The absence of authentication checks means that any internet user can exploit this flaw, significantly lowering the barrier to entry for attackers compared to authenticated vulnerabilities.
The operational impact of this vulnerability is severe due to the potential scope of data exposure and system compromise. Attackers can exfiltrate sensitive information including administrator usernames and password hashes, which may be cracked offline to gain full administrative control over the WordPress installation. Furthermore, depending on the database configuration and privileges granted to the web application user, an attacker might execute operating system commands through SQL injection techniques such as INTO OUTFILE or xp_cmdshell (in Microsoft SQL Server environments), leading to complete server compromise. This can result in defacement of the website, insertion of malicious scripts for cross-site scripting attacks against visitors, theft of customer data if e-commerce features are enabled, and disruption of service availability. The lack of authentication amplifies the risk as it allows automated scanning tools to rapidly identify and exploit vulnerable instances across large portions of the internet.
This vulnerability aligns with CWE-89, which classifies Improper Neutralization of Special Elements used in an SQL Command, commonly known as SQL Injection. It also maps to MITRE ATT&CK technique T1059, specifically subtechniques related to command and script interpreters or database commands, depending on the specific exploitation method employed. The unauthenticated nature of the flaw corresponds to initial access vectors where attackers leverage software vulnerabilities to gain a foothold in a network environment without needing valid user credentials.
To mitigate this risk, immediate action is required by upgrading the Books Gallery plugin to version 4.8.4 or later, which addresses these input validation and query construction issues. Administrators should ensure that all plugins are kept up-to-date with security patches released by their developers. Additionally, implementing a Web Application Firewall can provide an additional layer of defense by filtering out malicious SQL patterns in HTTP requests before they reach the application logic. It is also recommended to enforce principle of least privilege for database accounts used by web applications and to conduct regular code reviews focusing on secure coding practices such as parameterized queries to prevent similar vulnerabilities from being introduced in future updates or custom developments.