CVE-2024-9211 in FULL Cliente Plugin
Summary
by MITRE • 10/11/2024
The FULL – Cliente plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg & remove_query_arg without appropriate escaping on the URL in all versions up to, and including, 3.1.22. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
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Analysis
by VulDB Data Team • 03/07/2025
The vulnerability identified as CVE-2024-9211 affects the FULL – Cliente plugin for WordPress, specifically targeting versions up to and including 3.1.22. This represents a critical security flaw that exposes WordPress installations to reflected cross-site scripting attacks, potentially compromising the security of end users who interact with affected websites. The vulnerability stems from improper handling of URL parameters within the plugin's codebase, creating an attack vector that can be exploited by unauthenticated threat actors.
The technical flaw manifests through the insecure usage of WordPress functions add_query_arg and remove_query_arg without implementing proper output escaping mechanisms. These functions are designed to manipulate URL query parameters, but when used without appropriate sanitization or escaping, they allow malicious input to be reflected back to users in the browser. The vulnerability specifically occurs in the URL handling logic where user-supplied input is directly incorporated into query strings without proper validation or encoding. This pattern creates a classic reflected xss vector where attacker-controlled data flows through the application and back to the victim's browser.
The operational impact of this vulnerability extends beyond simple script injection, as it can enable attackers to execute arbitrary malicious code in the context of a victim's browser session. An attacker could craft malicious URLs containing script payloads that, when clicked by an unsuspecting user, would execute in the user's browser with the privileges of that user. This could lead to session hijacking, credential theft, redirection to malicious sites, or the execution of additional attacks such as defacement or data exfiltration. The vulnerability is particularly dangerous because it requires no authentication to exploit, making it accessible to any internet user who can influence a victim's browsing activity.
From a cybersecurity perspective, this vulnerability aligns with CWE-79, which describes cross-site scripting flaws where untrusted data is directly output to web pages without proper sanitization or escaping. The attack pattern follows the typical reflected xss methodology documented in the MITRE ATT&CK framework under technique T1566, specifically targeting the initial access phase through malicious links. The vulnerability demonstrates poor input validation practices and highlights the importance of implementing proper output encoding for all user-supplied data that flows into web contexts. Organizations using the affected plugin should immediately implement mitigations including plugin updates, input validation, and output escaping measures to prevent exploitation.
The security implications of this vulnerability underscore the critical need for WordPress plugin developers to follow secure coding practices and implement proper sanitization of all user inputs. The flaw represents a fundamental breach in the principle of least privilege and input validation, where the plugin fails to properly escape data before it is rendered in the browser context. This vulnerability serves as a reminder of the importance of regular security audits and the necessity of maintaining up-to-date software components to prevent exploitation of known security flaws. Organizations should conduct immediate vulnerability assessments to identify affected systems and implement appropriate controls to protect against potential exploitation attempts.