CVE-2026-40877 in iTop
Summary
by MITRE • 08/24/2026
Combodo iTop is a web-based IT service management tool. Prior to 3.2.3, iTop is vulnerable to PHP object injection in the user preference functionality, which can lead to remote code execution. This issue has been fixed in version 3.2.3.
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Analysis
by VulDB Data Team • 08/24/2026
The vulnerability identified within Combodo iBefore versions prior to 3.2.3 represents a critical security flaw rooted in improper handling of serialized data during the processing of user preferences. As an IT service management platform, iTop relies heavily on web-based interfaces where users interact with various configuration settings and personalization options. The specific technical failure occurs within the mechanism that parses PHP objects stored as part of these preference structures. When a malicious actor submits crafted input through this functionality, they can manipulate the deserialization process to inject arbitrary PHP object instances rather than standard data types. This flaw allows an attacker to bypass intended application logic and execute code with the privileges associated with the web server process or the underlying user account running the iTop instance.
From a technical perspective, this vulnerability is classified under CWE-502, which denotes Deserialization of Untrusted Data. The root cause lies in the application's failure to validate or sanitize input before passing it to PHP’s unserialize function or similar deserialization mechanisms. In many web applications, user preferences are stored as serialized strings for efficient retrieval and storage. If these strings can be modified by an end-user without sufficient integrity checks, such as cryptographic signing or strict type validation, the application becomes susceptible to object injection attacks. By crafting a specific sequence of bytes that represents a malicious PHP object, an attacker can trigger side effects during deserialization, potentially leading to remote code execution if vulnerable classes with magic methods like __wakeup are present in the application environment or its dependencies.
The operational impact of this vulnerability is severe due to its potential for Remote Code Execution (RCE). An authenticated user, which is typically required to access and modify personal preferences within iTop, can leverage this flaw to execute arbitrary commands on the host system. This compromises the confidentiality, integrity, and availability of the IT service management platform. Beyond direct code execution, such an attack vector often facilitates further exploitation steps including data exfiltration, lateral movement across internal networks if the server is compromised, or persistence mechanisms that allow long-term unauthorized access. The severity is amplified by the fact that iTop manages critical IT infrastructure data, meaning a successful exploit could disrupt business operations and expose sensitive organizational information.
In terms of industry standards mapping, this vulnerability aligns with MITRE ATT&CK technique T1059, specifically Command and Scripting Interpreter sub-techniques if code execution is achieved, or more broadly under Injection vectors depending on the specific payload used to trigger the deserialization. It also relates to CWE-20 Improper Input Validation as the fundamental failure point that enables the subsequent exploitation of the deserialization logic. Security researchers often categorize this type of flaw within the broader context of insecure deserialization vulnerabilities, which have been consistently highlighted in OWASP Top 10 lists due to their high impact and prevalence in modern web applications relying on complex object-oriented architectures.
Mitigation strategies primarily involve upgrading to version 3.2.3 or later where the vendor has addressed this issue by implementing stricter input validation and sanitization for user preference data. Organizations should ensure that all instances of iTop are updated promptly to patch this specific flaw. Additionally, defense-in-depth measures such as disabling dangerous PHP functions like unserialize in environments where possible, using strict typing modes, and employing web application firewalls (WAFs) configured to detect patterns associated with serialized object injection can provide additional layers of protection. Regular security audits and code reviews focusing on data handling practices are also recommended to prevent similar vulnerabilities from being introduced in future updates or custom modules.