CVE-2025-68853 in Contact Manager Plugin
Summary
by MITRE • 02/20/2026
Deserialization of Untrusted Data vulnerability in Kleor Contact Manager contact-manager allows Object Injection.This issue affects Contact Manager: from n/a through <= 9.1.1.
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Analysis
by VulDB Data Team • 02/22/2026
The CVE-2025-68853 vulnerability represents a critical deserialization flaw in Kleor Contact Manager's contact-manager component that enables object injection attacks. This vulnerability falls under the CWE-502 category, which specifically addresses deserialization of untrusted data, making it a prime target for attackers seeking to execute arbitrary code within the affected system. The vulnerability exists in all versions of Contact Manager up to and including version 9.1.1, indicating a widespread impact across multiple releases that have not received adequate security patches.
The technical flaw manifests when the application processes serialized data from untrusted sources without proper validation or sanitization mechanisms. When an attacker crafts malicious serialized objects and injects them into the application's data processing pipeline, the system attempts to deserialize these objects without sufficient security controls. This creates an opportunity for attackers to manipulate the deserialization process and execute arbitrary code with the privileges of the affected application. The vulnerability specifically affects the contact-manager component, which likely handles user data serialization for storage or transmission purposes.
The operational impact of this vulnerability is severe as it provides attackers with a potential pathway for remote code execution within the affected environment. An attacker could exploit this vulnerability to gain unauthorized access to the system, potentially leading to data breaches, privilege escalation, or complete system compromise. The attack surface is particularly concerning given that the vulnerability affects the contact-manager component, which likely handles sensitive user contact information and may be accessible through various network interfaces. This vulnerability could be leveraged in combination with other attack vectors to establish persistent access or escalate privileges within the target environment.
Organizations affected by CVE-2025-68853 should immediately implement mitigations including applying the latest security patches from Kleor, implementing network segmentation to limit access to the vulnerable component, and monitoring for suspicious deserialization activities. The ATT&CK framework categorizes this vulnerability under T1548.005 (Server Software Component Compromise) and T1059.007 (Command and Scripting Interpreter: PowerShell), indicating that attackers may use this vulnerability to establish persistence and execute malicious commands. Additional mitigations should include input validation, implementing secure deserialization practices, and conducting regular security assessments to identify similar vulnerabilities in other components. The vulnerability highlights the importance of following secure coding practices and implementing proper data validation mechanisms to prevent object injection attacks that could compromise the integrity and availability of critical business systems.