Compliance Impact

The vulnerability allows authenticated attackers to achieve remote code execution on the affected system by uploading malicious files outside the intended directory, potentially leading to unauthorized access or modification of sensitive data.

Such unauthorized access and potential data breaches could impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive information against unauthorized access and ensure system integrity.

However, the provided information does not explicitly detail the direct compliance implications or specific regulatory impacts of this vulnerability.

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Impact Analysis

This vulnerability can have severe impacts as it allows an authenticated attacker with upload permissions to execute arbitrary code on the affected server.

By writing a PHP webshell to a web-accessible directory, the attacker gains remote code execution capabilities with the same privileges as the web server process.

This can lead to full compromise of the server, unauthorized access to sensitive data, disruption of services, and further attacks within the network.

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Executive Summary

CVE-2026-41463 is a ZipSlip path traversal vulnerability affecting ProjeQtor versions 7.0 through 12.4.3. It exists in the plugin upload functionality, specifically via the uploadPlugin.php script.

Authenticated users with upload permissions can exploit this vulnerability by crafting malicious ZIP archives containing directory traversal sequences. This allows them to write files outside the intended extraction directory.

By exploiting this flaw, attackers can place a PHP webshell into a web-accessible directory, enabling remote code execution with the privileges of the web server process.

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Detection Guidance

Detection of this vulnerability involves identifying malicious ZIP archives containing directory traversal sequences being uploaded via the plugin upload functionality (uploadPlugin.php) in ProjeQtor versions 7.0 through 12.4.3.

You can monitor web server logs for suspicious upload requests to uploadPlugin.php and look for ZIP files with filenames containing directory traversal patterns such as "../" or "%2e%2e%2f".

Additionally, scanning the web-accessible directories for unexpected PHP files (such as webshells) that were not part of the original installation can help detect exploitation.

Example commands to detect suspicious files or uploads might include:

• Using grep to find directory traversal patterns in upload logs: grep -E "\.\./|%2e%2e%2f" /var/log/apache2/access.log
• Finding recently created or modified PHP files in web directories: find /var/www/html -type f -name "*.php" -mtime -7
• Checking for ZIP files with suspicious paths inside: unzip -l suspicious.zip | grep "\.\./"

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Mitigation Strategies

Immediate mitigation steps include restricting or disabling the plugin upload functionality for users who do not absolutely need it.

Ensure that only trusted and authenticated users with upload permissions can access the uploadPlugin.php script.

Implement input validation and sanitization on ZIP archive extraction to prevent directory traversal sequences from being processed.

As a temporary measure, monitor and block uploads containing directory traversal sequences in ZIP filenames.

Update ProjeQtor to a version later than 12.4.3 once a patch is available to fully resolve the vulnerability.

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