Detection Guidance

This vulnerability involves a Man-in-the-Middle (MITM) attack exploiting an insecure HTTP-based plugin-fetching mechanism in QuickCMS versions prior to 6.8. Detection involves monitoring network traffic for unencrypted HTTP requests to the plugin list endpoint and checking for unexpected or suspicious content being fetched.

You can detect attempts or presence of this vulnerability by capturing and analyzing HTTP traffic to the QuickCMS plugin endpoint to identify if plugin data is being fetched over HTTP instead of HTTPS, which could allow MITM attacks.

Suggested commands to detect this vulnerability include using network traffic analysis tools such as tcpdump or Wireshark to filter HTTP requests to the plugin list endpoint.

• Using tcpdump to capture HTTP traffic on port 80 related to QuickCMS plugin fetching: tcpdump -i any -s 0 -A 'tcp port 80 and (host your_quickcms_server)'
• Using curl to manually check if the plugin list endpoint is served over HTTP and inspect the response: curl -v http://your_quickcms_server/path_to_plugin_list
• Using a web proxy tool like Burp Suite or OWASP ZAP to intercept and analyze plugin list requests and responses for injected or unexpected scripts.

If you observe plugin list data being fetched over unencrypted HTTP or unexpected JavaScript/HTML content in the plugin list response, it indicates potential exploitation or vulnerability presence.

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Compliance Impact

The vulnerability in QuickCMS allows a Man-in-the-Middle (MITM) attacker to inject arbitrary HTML or JavaScript via an insecure plugin-fetching mechanism, leading to Cross-Site Scripting (XSS). This can result in unauthorized execution of scripts in the context of the user, potentially exposing sensitive information or enabling further attacks.

Such vulnerabilities can impact compliance with standards like GDPR and HIPAA because they may lead to unauthorized access or disclosure of personal or protected health information. Organizations using vulnerable versions of QuickCMS without the patch may fail to adequately protect user data, thus risking non-compliance with data protection regulations that require safeguarding against unauthorized data access and ensuring data integrity.

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Executive Summary

QuickCMS is vulnerable to Cross-Site Scripting (XSS) due to its insecure HTTP-based plugin-fetching mechanism.

An attacker can perform a Man-in-the-Middle (MITM) attack by impersonating the opensolution.org server and serving malicious HTML or JavaScript at the plugin list endpoint.

When a user accesses the plugin page, the malicious content is automatically fetched, rendered, and executed in the user's browser.

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Impact Analysis

This vulnerability allows an attacker to inject and execute arbitrary HTML or JavaScript code in the context of the QuickCMS plugin page.

Such an attack can lead to unauthorized actions performed on behalf of the user, theft of sensitive information, session hijacking, or other malicious activities.

The attack requires the attacker to be able to intercept and modify network traffic between the user and the plugin server (MITM).

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Mitigation Strategies

The vulnerability in QuickCMS is fixed in version 6.8, which was published on 15.05.2026.

To mitigate this vulnerability immediately, you should update your QuickCMS deployment to version 6.8 or later.

Until the patch is applied, avoid accessing the plugin page over insecure networks where a Man-in-the-Middle attack could be performed.

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