CVE-2025-64633 in Norebro Extra Plugin
Summary
by MITRE • 12/16/2025
Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability in colabrio Norebro Extra norebro-extra allows Code Injection.This issue affects Norebro Extra: from n/a through <= 1.6.8.
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Analysis
by VulDB Data Team • 12/16/2025
The CVE-2025-64633 vulnerability represents a critical cross-site scripting weakness in the colabrio Norebro Extra plugin for WordPress, specifically impacting versions ranging from the initial release through version 1.6.8. This vulnerability falls under the Common Weakness Enumeration category CWE-79, which defines improper neutralization of input during web page generation as a fundamental security flaw. The issue manifests as a basic XSS attack vector that allows malicious actors to inject and execute arbitrary code within the context of a user's browser session. The vulnerability stems from inadequate sanitization of user-supplied input that is subsequently rendered in HTML output without proper encoding or filtering mechanisms.
The technical exploitation of this vulnerability occurs when the Norebro Extra plugin fails to properly validate and sanitize data submitted through web forms or user input fields. Attackers can craft malicious payloads containing HTML tags and JavaScript code that gets stored and subsequently executed when other users view the affected web page. This creates a persistent threat where the injected code can perform actions such as stealing session cookies, redirecting users to malicious sites, or defacing the website content. The vulnerability specifically targets the plugin's handling of user-generated content that is displayed in web pages without adequate HTML escaping or context-appropriate sanitization measures.
The operational impact of CVE-2025-64633 extends beyond simple code injection, as it can lead to complete compromise of affected websites and user sessions. When exploited, this vulnerability enables attackers to execute arbitrary JavaScript code in the context of legitimate users, potentially allowing for session hijacking, data exfiltration, or further exploitation of the compromised system. The vulnerability's persistence means that once exploited, malicious code can continue to affect users until the plugin is updated or the vulnerability is patched. This makes it particularly dangerous for websites that rely heavily on user interaction or content submission, as the attack surface expands with each user-generated input field that lacks proper validation.
Mitigation strategies for CVE-2025-64633 must prioritize immediate plugin updates to versions that address the XSS vulnerability through proper input sanitization and output encoding. Security administrators should implement comprehensive input validation mechanisms that filter and sanitize all user-supplied data before processing or storage. The recommended approach includes applying the principle of least privilege by ensuring that user input is properly escaped when rendered in HTML contexts, utilizing context-appropriate encoding techniques such as HTML entity encoding for display contexts. Additionally, implementing Content Security Policy headers can provide an additional layer of protection by restricting the sources from which scripts can be loaded and executed, thereby limiting the impact of successful XSS attempts. Organizations should also conduct regular security audits of their web applications to identify and remediate similar vulnerabilities that may exist within their codebase, following established security frameworks such as those recommended by the Open Web Application Security Project.