CVE-2026-27462 in iTop
Summary
by MITRE • 08/21/2026
Combodo iTop is a web based IT service management tool. Prior to 3.2.3, iTop returns different responses for valid/invalid usernames depending on multiple factors in the reset password mechanism, leading to user enumeration. This issue has been fixed in version 3.2.3.
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Analysis
by VulDB Data Team • 08/21/2026
Combodo iTop is a widely deployed web-based IT service management platform designed to streamline incident tracking, asset management, and customer relationship processes within enterprise environments. The software serves as a central hub for IT operations teams, handling sensitive organizational data including user credentials, infrastructure details, and operational workflows. As such, the integrity of its authentication mechanisms is critical to maintaining overall system security. A significant vulnerability was identified in versions prior to 3.2.3 regarding the password reset functionality, which exposed users to account enumeration attacks through inconsistent response behaviors.
The core technical flaw lies in how the application handles requests for password resets when provided with varying username inputs. Specifically, the server returns distinguishable responses depending on whether a submitted username corresponds to an existing user or not. This discrepancy can manifest as differences in HTTP status codes, response payload content, timing delays, or error message text. For instance, a request for a non-existent account might trigger a generic internal server error or a specific validation failure, while a valid account might proceed to the next step of the reset workflow or return a success indicator indicating that an email has been sent. This behavior violates the principle of uniform response handling, which is essential for preventing information leakage during authentication processes.
This inconsistency enables attackers to perform user enumeration with high reliability. By systematically submitting different usernames and analyzing the server's responses, an adversary can determine which accounts are active within the iTop instance without needing valid credentials. This capability significantly lowers the barrier for subsequent attacks such as brute force password guessing or targeted phishing campaigns. Once a list of valid users is compiled, attackers can focus their efforts on high-privilege accounts like administrators or service managers, increasing the likelihood of successful compromise and potential lateral movement within the network.
From a classification perspective, this vulnerability aligns with CWE-204: Observable Response Discrepancy, which describes situations where an application reveals information through differences in its responses to different inputs. It also relates closely to CWE-284: Improper Access Control if the enumeration allows unauthorized discovery of user identities that should remain hidden from unauthenticated users. In terms of offensive security frameworks, this behavior facilitates reconnaissance activities categorized under MITRE ATT&CK technique T1087: Account Discovery, which is often a precursor to credential-based attacks such as brute force (T1110) or phishing for credentials (T1534).
The operational impact of this vulnerability extends beyond mere identity disclosure. It undermines the confidentiality and integrity of the authentication system by providing attackers with valuable intelligence about the user base. This can lead to increased attack surface exposure, where known valid accounts become primary targets for automated tools designed to crack weak passwords or exploit other associated vulnerabilities specific to those roles. Furthermore, in environments where iTop is integrated with external identity providers or single sign-on solutions, enumerating local users might reveal discrepancies between internal and federated identities, potentially exposing architectural weaknesses.
Mitigation strategies primarily involve upgrading the software to version 3.2.3 or later, as this release addresses the underlying logic flaw by ensuring that all password reset requests return identical responses regardless of whether the username exists in the database. For organizations unable to immediately patch due to operational constraints, temporary mitigations include implementing rate limiting on the password reset endpoint to slow down automated enumeration attempts and configuring web application firewalls to detect and block patterns indicative of user enumeration attacks. Additionally, ensuring that all error messages are generic and do not leak internal state information can reduce the effectiveness of manual probing efforts until a permanent fix is applied.