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CVE-2025-55010: Arbitrary PHP Object Instantiation in Kanboard Prior to Version 1.2.47

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Overview

A serious vulnerability has been identified in Kanboard, the project management software that is popular amongst many organizations who follow the Kanban methodology. The vulnerability, identified as CVE-2025-55010, allows admin users to instantiate arbitrary PHP objects, leading to potential system compromise or data leakage. This vulnerability is especially critical because of the high severity score assigned to it, as well as the potential damage it can cause if exploited.

Vulnerability Summary

CVE ID: CVE-2025-55010
Severity: Critical (CVSS: 9.1)
Attack Vector: Network
Privileges Required: High (Admin rights)
User Interaction: Required
Impact: System Compromise, Data leakage

Affected Products

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Product | Affected Versions

Kanboard | Prior to 1.2.47

How the Exploit Works

In the versions prior to 1.2.47, Kanboard had an unsafe deserialization vulnerability in the ProjectEventActvityFormatter. Admin users had the ability to instantiate arbitrary PHP objects by modifying the event[“data”] field in the project_activities table. A malicious actor could update this field to use a PHP gadget to write a web shell into the /plugins folder, which consequently gives remote code execution on the host system.

Conceptual Example Code

A rough example of exploiting this vulnerability might look like this:

UPDATE project_activities SET event['data'] = 'O:8:"stdClass":1:{s:4:"code";s:48:"system($_GET['cmd']);";}' WHERE id = [target_id]

This query modifies the event[“data”] field to include a PHP gadget, which is a piece of code that can be used to inject a web shell into the /plugins folder. Once the web shell is there, it can be used to execute arbitrary code on the host system.

Mitigation

The vulnerability has been patched in version 1.2.47 of Kanboard. Therefore, users are strongly advised to update to this version as soon as possible. If for any reason an immediate update is not possible, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as a temporary mitigation measure.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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