CVE-2026-5615 Scanner

VvvebJs is a widely used website builder library that allows developers to create and design web pages with ease. It is utilized by web developers and designers to streamline the process of website creation through a drag-and-drop interface and custom scripting options. The tool is appreciated for its flexibility and capability to support both advanced coding and simpler design requirements. VvvebJs is predominantly implemented in environments where a quick setup for lightweight applications or prototypes is needed. Its framework is open-source, allowing for customization and improvement by a broad community of developers to continuously meet new demands. The upload functionality in VvvebJs aids in customizing website content, but vulnerabilities like those highlighted here can impact its security profile.

The scanned vulnerability, Cross-Site Scripting (XSS), permits attackers to inject malicious scripts into web pages viewed by other users. This type of vulnerability can severely compromise the security of user interactions on a website. An XSS vulnerability arises when untrusted data is included in a web page without proper validation or escaping. Attackers use this vulnerability to execute scripts in the user's browser that the site does not authorize. If exploited, it can lead to hijacking of user sessions, deployment of trojans, or dynamic alteration of the website interface. Addressing this vulnerability involves secure coding practices and the sanitization of user inputs.

The specific vulnerability in VvvebJs is caused by improper handling of inputs in the "uploadAllowExtensions" argument within the upload.php file upload endpoint. Attackers manipulate this parameter to upload an SVG file containing malicious scripts. The unsanitized SVG contents execute automatically when displayed in a browser, demonstrating the stored nature of the attack. Successful exploitation hinges upon the crafted input reaching the upload function and being stored unsanitized. As this occurs within the VvvebJs framework, updates or patches to the software are essential to mitigate the security risks involved.

The possible effects of exploiting this XSS vulnerability are varied and potentially critical. When exploited, it could result in unauthorized execution of scripts on behalf of logged-in users, leading to session hijacking, theft of sensitive information, or redirection to phishing sites. Websites compromised through XSS might also go undetected for a significant time, amplifying the impact on an organization's data security and user trust. Moreover, attackers can use these scripts to manipulate website operations or data, further compromising business processes or user experience.

REFERENCES

• https://github.com/advisories/GHSA-p873-9x3v-gmvh
• https://github.com/givanz/VvvebJs