CVE-2025-59332 is a high-severity cross-site scripting (XSS) vulnerability affecting versions 1.0 through 1.8 of the 3DAlloy extension developed by dolfinus for MediaWiki. 3DAlloy is a lightweight 3D viewer that allows embedding 3D content within MediaWiki pages using a custom <3d> parser tag and the {{#3d}} parser function. The vulnerability arises because these input mechanisms permit users to specify custom attributes that are directly appended to the canvas HTML element without proper sanitization or neutralization. This lack of input validation enables an attacker to inject arbitrary JavaScript code, which will then execute in the context of the victim's browser when the vulnerable page is viewed. The CVSS v3.1 base score is 8.6, indicating a high severity, with the vector indicating network attack vector, low attack complexity, no privileges required, no user interaction needed, and an impact primarily on confidentiality with some impact on integrity and availability. Although no known exploits are currently reported in the wild, the vulnerability's characteristics make it a significant risk for web environments using this extension. The flaw is categorized under CWE-79, which is improper neutralization of input during web page generation, a common and dangerous web vulnerability that can lead to session hijacking, data theft, or defacement. Since the vulnerability affects the HTML canvas element, which is integral to rendering 3D content, the injected scripts could manipulate the DOM or steal sensitive information accessible in the browser context. The absence of patches at the time of publication further elevates the urgency for mitigation.

For European organizations utilizing MediaWiki with the 3DAlloy extension versions 1.0 to 1.8, this vulnerability poses a significant threat to web application security. Successful exploitation could allow attackers to execute arbitrary JavaScript in the context of users visiting affected wiki pages, potentially leading to session hijacking, unauthorized data access, or the spread of malware within the organization. This is particularly critical for organizations relying on MediaWiki for internal knowledge bases, documentation, or collaborative projects, where sensitive or proprietary information may be exposed. The impact extends to confidentiality, as attackers can steal cookies or tokens, integrity, by manipulating displayed content or injecting malicious scripts, and availability, if the injected scripts disrupt normal operations or cause denial of service. Given the network attack vector and no requirement for user interaction or privileges, the vulnerability can be exploited remotely and at scale, increasing the risk of widespread compromise. European organizations in sectors such as government, research, education, and enterprises that heavily use MediaWiki for collaboration are especially at risk. Additionally, the lack of known exploits currently provides a window for proactive mitigation before active exploitation occurs.

To mitigate CVE-2025-59332, European organizations should take immediate and specific actions beyond generic advice: 1) Audit all MediaWiki instances to identify deployments of the 3DAlloy extension and determine the version in use. 2) Disable or restrict the use of the <3d> parser tag and {{#3d}} parser function until a secure patch or update is available. This can be done by modifying MediaWiki configuration to disable the extension or restrict parser function usage to trusted users only. 3) Implement strict input validation and sanitization on any user-supplied attributes passed to the 3DAlloy extension, ideally by applying a whitelist of allowed attributes and escaping any special characters before rendering. 4) Monitor web server and application logs for unusual or suspicious requests targeting the 3DAlloy functionality, which could indicate attempted exploitation. 5) Educate wiki administrators and users about the risks of injecting untrusted content and encourage reporting of suspicious behavior. 6) Follow the vendor’s channels closely for the release of patches or updated versions that address this vulnerability and apply them promptly. 7) As a longer-term measure, consider isolating MediaWiki instances or restricting access to trusted networks to reduce exposure. 8) Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers accessing the wiki pages, mitigating the impact of potential XSS attacks.