Compliance Impact

The vulnerability in MixPHP Framework 2.x allows client-side remote code execution (RCE) through unsafe deserialization of server responses. This can enable attackers to execute arbitrary code if they control or intercept server responses.

Such a vulnerability can lead to unauthorized access, data breaches, or lateral movement within a network, potentially exposing sensitive personal or health information.

Consequently, this could impact compliance with regulations like GDPR and HIPAA, which mandate protection of personal and health data against unauthorized access and breaches.

Organizations using affected versions of MixPHP may face increased risk of non-compliance due to potential data compromise stemming from this vulnerability.

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Executive Summary

CVE-2026-42471 is an unsafe deserialization vulnerability in the MixPHP Framework versions 2.x through 2.2.17. The vulnerability occurs because the sync-invoke client calls the PHP unserialize() function on data received from the server response without proper validation.

This means that if the client connects to a malicious server or if an attacker can intercept the communication between the client and server, they can craft malicious serialized data that, when unserialized by the client, can lead to remote code execution (RCE) on the client side.

The root cause is the client-side unserialize() processing untrusted data, which can be exploited using PHP POP chains to execute arbitrary code.

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Impact Analysis

This vulnerability can have serious impacts including allowing an attacker to execute arbitrary code on the client machine running the MixPHP sync-invoke client.

If exploited, an attacker could gain control over the client environment, potentially leading to lateral movement within a network if the client is part of a larger system.

This could result in unauthorized access, data theft, system compromise, or disruption of services depending on the privileges of the client application.

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Detection Guidance

This vulnerability involves unsafe deserialization in the MixPHP Framework sync-invoke client, which calls unserialize() on server responses. Detection involves monitoring network traffic for suspicious serialized PHP data being received from untrusted or unknown servers.

To detect exploitation attempts or presence of this vulnerability on your system, you can:

• Capture and inspect network traffic to identify serialized PHP data being received by the MixPHP client, especially from untrusted sources.
• Use network packet capture tools like tcpdump or Wireshark to filter traffic on ports used by MixPHP sync-invoke client.
• Check application logs for errors or unusual unserialize() calls or exceptions around Connection.php line 76.

Example commands:

• tcpdump -i eth0 -A 'tcp port <mixphp_sync_invoke_port>' | grep -i 'O:\\' # Look for serialized PHP objects in traffic
• grep -r 'unserialize' /path/to/mixphp/logs/ # Search logs for unserialize usage or errors

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Mitigation Strategies

Immediate mitigation steps for this vulnerability include:

• Avoid connecting the MixPHP sync-invoke client to untrusted or potentially malicious servers.
• Implement network-level controls such as firewall rules to restrict outbound connections from the client to only trusted servers.
• Monitor and audit client-server communications for unexpected serialized data.
• If possible, update or patch the MixPHP Framework to a version that addresses this unsafe deserialization issue.
• Consider adding validation or sanitization before unserialize() calls in the client code to prevent processing untrusted data.

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