Executive Summary

CVE-2026-2946 is a cross-site scripting (XSS) vulnerability found in the rymcu forest software versions up to 0.0.5. It exists in the function XssUtils.replaceHtmlCode, which is responsible for processing user input in components like Article Content, Comments, and Portfolio.

The vulnerability occurs because the function fails to properly sanitize or neutralize user-controllable input before embedding it into web pages. This allows attackers to inject malicious scripts that execute in the browsers of users viewing the affected content.

Exploitation is possible remotely and requires some user interaction. The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation) and has a publicly available proof-of-concept exploit.

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Impact Analysis

This vulnerability allows authenticated attackers to inject malicious JavaScript code into input fields such as article content, comments, and portfolio descriptions.

When other users view the affected content, the injected scripts execute in their browsers, potentially leading to session hijacking, data theft, or other malicious actions.

Because the attack can be performed remotely and the exploit is publicly available, it poses a risk to the integrity and security of the affected web application and its users.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability is a stored Cross-Site Scripting (XSS) issue in the rymcu forest software up to version 0.0.5, specifically in the function XssUtils.replaceHtmlCode. Detection involves identifying if malicious JavaScript code has been injected into input fields such as article content, comments, or portfolio descriptions.'}, {'type': 'paragraph', 'content': 'Since the vulnerability involves stored XSS, detection can be performed by inspecting the web application inputs and outputs for unsanitized or improperly neutralized scripts.'}, {'type': 'list_item', 'content': 'Manually review input fields in the application for suspicious script tags or JavaScript code.'}, {'type': 'list_item', 'content': 'Use web vulnerability scanners that detect XSS vulnerabilities by injecting test scripts and analyzing responses.'}, {'type': 'list_item', 'content': 'Monitor HTTP traffic for suspicious payloads containing script tags or JavaScript code in POST requests to the affected application.'}, {'type': 'list_item', 'content': "Example command using curl to test input fields for XSS injection: curl -X POST -d 'comment=<script>alert(1)</script>' https://your-rymcu-forest-instance/path-to-comment-endpoint"}, {'type': 'list_item', 'content': 'Use browser developer tools or intercepting proxies (e.g., Burp Suite) to inject and detect XSS payloads in the application.'}] [1, 2]

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Mitigation Strategies

There are no known vendor-provided patches or mitigations for this vulnerability as the vendor did not respond to the disclosure.

Immediate mitigation steps include:

• Avoid using the affected version (up to 0.0.5) of the rymcu forest software.
• Consider replacing the affected component with an alternative product that does not have this vulnerability.
• Implement additional input validation and output encoding on the web application to neutralize or sanitize user inputs before rendering.
• Use web application firewalls (WAFs) to detect and block malicious XSS payloads targeting the application.
• Educate users to be cautious about interacting with suspicious content that may exploit this vulnerability.

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