CVE-2024-34481 is a cross-site scripting (XSS) vulnerability identified in drupal-wiki.com Drupal Wiki versions prior to 8.31.1. The vulnerability arises from insufficient sanitization of user-supplied input fields including comments, captions, and image titles on Wiki pages. This allows an attacker to inject malicious JavaScript code that executes in the context of other users viewing the affected Wiki pages. The CVSS 3.1 base score is 6.1, reflecting a medium severity level. The attack vector is network-based (AV:N), requiring no privileges (PR:N) but does require user interaction (UI:R), such as clicking a link or viewing a compromised page. The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact affects confidentiality and integrity partially (C:L/I:L) but does not affect availability (A:N). No known exploits have been reported in the wild, and no official patches are linked, though upgrading to version 8.31.1 or later is recommended. The underlying weakness corresponds to CWE-79, which is a common XSS flaw due to improper input validation and output encoding. This vulnerability could be leveraged to steal session cookies, perform actions on behalf of authenticated users, or conduct phishing attacks within the Wiki environment. Since Drupal Wiki is often used for collaborative documentation, the risk includes unauthorized data disclosure and manipulation of content integrity.

For European organizations, this vulnerability poses a risk to the confidentiality and integrity of internal Wiki content and user sessions. Attackers exploiting this XSS flaw could hijack user sessions, leading to unauthorized access to sensitive information or modification of Wiki pages. This can disrupt collaboration, damage organizational reputation, and potentially serve as a foothold for further attacks within the network. Organizations relying on Drupal Wiki for knowledge management or internal documentation are particularly vulnerable. The lack of known exploits reduces immediate risk, but the ease of exploitation (no privileges required and network accessible) means that targeted phishing or social engineering campaigns could trigger successful attacks. The impact is heightened in sectors with strict data protection requirements, such as finance, healthcare, and government agencies, where leakage or tampering of information could have regulatory and operational consequences.

To mitigate CVE-2024-34481, European organizations should promptly upgrade all Drupal Wiki instances to version 8.31.1 or later, where the vulnerability is addressed. In the absence of immediate patching, implement strict input validation and output encoding on all user-controllable fields including comments, captions, and image titles to neutralize malicious scripts. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts within the Wiki environment. Conduct regular security audits and penetration testing focused on Wiki applications to detect similar injection flaws. Educate users about the risks of clicking on suspicious links or interacting with untrusted Wiki content. Monitor web server logs and application behavior for unusual activity indicative of XSS exploitation attempts. Additionally, consider isolating the Wiki platform from critical internal systems to limit potential lateral movement in case of compromise.