CVE-2025-30548 in Advanced Post Search Plugin
Summary
by MITRE • 04/01/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in VarDump s.r.l. Advanced Post Search allows Reflected XSS. This issue affects Advanced Post Search: from n/a through 1.1.0.
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Analysis
by VulDB Data Team • 04/01/2025
This vulnerability represents a classic cross-site scripting flaw that undermines the security of web applications by allowing malicious actors to inject client-side scripts into web pages viewed by other users. The vulnerability exists within the Advanced Post Search plugin developed by VarDump s.r.l., specifically affecting versions ranging from an unspecified starting point through version 1.1.0. The issue manifests as reflected cross-site scripting, meaning that malicious input is immediately reflected back in the application's response without proper sanitization or encoding, creating an opportunity for attackers to execute arbitrary scripts in the context of a victim's browser.
The technical flaw stems from inadequate input validation and output encoding mechanisms within the plugin's web page generation process. When user-supplied data is processed and subsequently rendered in web responses without appropriate neutralization measures, attackers can craft malicious payloads that exploit this weakness. The reflected nature of the vulnerability indicates that the malicious script must be injected through external means such as crafted URLs or form submissions, where the application reflects the input back to the user's browser without proper sanitization. This type of vulnerability directly maps to CWE-79, which categorizes improper neutralization of input during web page generation as a primary weakness leading to cross-site scripting attacks. The vulnerability's classification aligns with ATT&CK technique T1566.001, which describes the use of malicious links and URLs to deliver payloads to target systems through phishing or social engineering campaigns.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform session hijacking, steal sensitive cookies, redirect users to malicious sites, or even modify the content of web pages viewed by legitimate users. An attacker could exploit this vulnerability by constructing a malicious URL containing script payloads that, when clicked by an unsuspecting user, would execute in the user's browser context. This could lead to unauthorized access to user accounts, data theft, or the compromise of the entire web application's security posture. The reflected nature of the vulnerability means that the attack vector is typically delivered through social engineering tactics, where users are tricked into clicking malicious links that contain the XSS payload. The vulnerability affects the plugin's search functionality, suggesting that any input submitted through search forms or query parameters could potentially be exploited, making it particularly dangerous in environments where users frequently interact with search capabilities.
Mitigation strategies should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application's data flow. Developers should employ proper HTML encoding of user-supplied content before rendering it in web pages, ensuring that special characters are properly escaped to prevent script execution. The implementation of Content Security Policy headers can provide additional defense-in-depth measures by restricting the sources from which scripts can be loaded. Regular security audits and code reviews should be conducted to identify similar input handling vulnerabilities, while the plugin should be updated to the latest version where this vulnerability has been addressed. Organizations should also consider implementing web application firewalls to detect and block malicious payloads attempting to exploit this vulnerability. The security community should monitor for any additional related vulnerabilities that may exist within the same codebase, as this type of input handling weakness often indicates broader security issues that require comprehensive remediation.