CVE-2023-1435 in Ajax Search Pro Plugin
Summary
by MITRE • 04/24/2023
The Ajax Search Pro WordPress plugin before 4.26.2 does not sanitise and escape various parameters before outputting them back in pages, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin
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Analysis
by VulDB Data Team • 03/18/2025
The vulnerability identified as CVE-2023-1435 affects the Ajax Search Pro WordPress plugin version 4.26.1 and earlier, representing a critical security flaw that exposes web applications to reflected cross-site scripting attacks. This issue stems from insufficient sanitization and escaping of user-supplied parameters within the plugin's codebase, creating a pathway for malicious actors to inject arbitrary script code into web pages viewed by legitimate users. The vulnerability specifically targets parameters that are processed and subsequently output back to users without proper validation, making it particularly dangerous when exploited against administrative accounts with elevated privileges.
The technical implementation of this flaw involves the plugin's failure to properly sanitize input data before incorporating it into HTML output contexts. When users interact with the search functionality or other plugin features, parameters such as search terms, filter values, or other user-controllable inputs are directly embedded into web page responses without adequate encoding or validation. This creates a reflected XSS vulnerability where malicious payloads can be executed in the context of a victim's browser session, particularly when those sessions belong to privileged users such as administrators. The vulnerability maps directly to CWE-79, which describes improper neutralization of input during web page generation, and aligns with ATT&CK technique T1190, which covers exploiting vulnerabilities in web applications to execute malicious code.
The operational impact of this vulnerability extends beyond simple script injection, as it specifically targets high-privilege users, amplifying the potential damage significantly. An attacker who successfully exploits this vulnerability could execute arbitrary JavaScript code within the administrative context of the WordPress site, potentially gaining complete control over the affected system. This could enable attackers to modify content, steal sensitive data, manipulate user accounts, or even install malware. The reflected nature of the attack means that exploitation typically requires social engineering to trick administrators into clicking malicious links, but once executed, the consequences can be catastrophic. The vulnerability affects the core functionality of the search plugin and could be leveraged to bypass security controls or escalate privileges within the WordPress environment, particularly when combined with other exploitation techniques.
Mitigation strategies for CVE-2023-1435 focus primarily on immediate remediation through plugin updates to version 4.26.2 or later, which contain proper sanitization and escaping mechanisms. Administrators should also implement additional security measures including input validation at multiple layers, output encoding for all dynamic content, and regular security audits of installed plugins. The WordPress security community recommends maintaining up-to-date software versions, implementing web application firewalls, and monitoring for suspicious activity patterns that might indicate exploitation attempts. Organizations should also consider implementing content security policies to limit the execution of unauthorized scripts and establish incident response procedures to quickly address potential exploitation attempts. The vulnerability demonstrates the critical importance of proper input validation and output encoding in web applications, particularly those handling user-supplied data in privileged contexts.