Platform
php
Component
bludit
Fixed in
3.17.3
3.18.1
CVE-2026-4420 represents a Stored Cross-Site Scripting (XSS) vulnerability within Bludit's page creation feature. A successful exploit allows an authenticated attacker with page creation privileges to inject malicious JavaScript code into article tags, leading to potential execution when a victim views the resource. This vulnerability affects Bludit versions 3.17.2 through 3.18.0 and poses a significant risk as it could be leveraged to automatically create a new site administrator.
CVE-2026-4420 affects Bludit, exposing websites to a Stored Cross-Site Scripting (XSS) vulnerability. The vulnerability resides within the page creation functionality, allowing an authenticated attacker with page creation privileges (Author, Editor, or Administrator) to inject malicious JavaScript code into the 'tags' field of a newly created article. Once created, this article can be accessed by any user, even without authentication, resulting in the execution of the malicious script. This could lead to cookie theft, redirection to malicious websites, or modification of the website's content. The severity of this issue lies in the ease with which an attacker can exploit it and the potential damage it can cause, including the automation of malicious content creation.
An attacker with Author, Editor, or Administrator privileges on a Bludit site can exploit this vulnerability. The attacker creates a new article and inserts malicious JavaScript code into the 'tags' field. Once published, any user visiting the article's page will execute the script. Given that the page is accessible without authentication, the impact can be significant, affecting all website visitors. The lack of an official fix increases the risk, as attackers can exploit this vulnerability until an update is released. The attacker could automate the creation of malicious articles to maximize impact.
Exploit Status
EPSS
0.12% (31% percentile)
CISA SSVC
Currently, there is no official fix provided by the Bludit team for CVE-2026-4420. The most effective mitigation is to update to the latest version of Bludit as soon as it becomes available. In the meantime, implementing additional security measures is recommended, such as validating and sanitizing all user inputs, especially in fields that are displayed publicly. It's also crucial to review user permissions to limit access to page creation only to those who genuinely require it. Monitoring the website logs for suspicious activity can help detect and respond to potential attacks. Consider using a Web Application Firewall (WAF) to provide an additional layer of protection.
Actualice Bludit a una versión corregida. Dado que el proveedor no ha proporcionado información sobre versiones corregidas, se recomienda monitorear el repositorio de GitHub para actualizaciones o soluciones alternativas. Verifique y sanee los datos de entrada del usuario para prevenir la inyección de código malicioso.
Vulnerability analysis and critical alerts directly to your inbox.
Stored XSS (or persistent) occurs when an attacker injects malicious code into a website, which is then executed in the browsers of other users. In this case, the code is stored in the website's database and displayed to users when they visit the page.
If you are using an older version and haven't implemented mitigation measures, you are likely vulnerable. Review your website logs for suspicious activity related to page creation.
Immediately change the passwords of all administrator users. Scan your website for malicious code and remove it. Consider restoring a clean backup of your website.
Several vulnerability scanning tools can help detect XSS, both automated and manual. Some popular tools include OWASP ZAP and Burp Suite.
A Web Application Firewall (WAF) is a security layer that protects web applications from common attacks, including XSS. It acts as a filter between users and the website, blocking malicious traffic.
Upload your dependency file and we'll tell you instantly if this and other CVEs hit you.