CVE-2026-102113 in Kiteworks
Summary
by MITRE • 10/01/2026
A privilege escalation vulnerability in Kiteworks could allow an attacker who has already obtained code execution as an unprivileged backend service account on the appliance to escalate to root. A privileged routine did not safely handle a filesystem path that the lower-privileged account could influence, allowing the attacker to cause a root-owned operation to run arbitrary commands with the highest privileges. Exploitation requires existing local access to that service account.
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Analysis
by VulDB Data Team • 10/01/2026
The vulnerability described represents a classic privilege escalation flaw within the Kiteworks appliance architecture, specifically targeting the boundary between unprivileged backend services and privileged system operations. This issue stems from improper handling of filesystem paths by a routine operating with elevated privileges. When an attacker has already achieved code execution as an unprivileged backend service account, they possess the ability to manipulate specific inputs that are subsequently processed by higher-privilege processes without adequate sanitization or validation. The core technical flaw lies in the failure to properly canonicalize or restrict filesystem paths provided by lower-privileged entities. This oversight allows the attacker to construct a path that points outside of intended directories or targets sensitive system locations, effectively tricking the privileged routine into performing actions on files controlled by the unprivileged user.
From an operational perspective, this vulnerability enables a lateral movement from a low-level service account to full root access on the appliance. Root privileges grant unrestricted control over the operating system, allowing the attacker to install persistent backdoors, exfiltrate sensitive data stored within the Kiteworks environment, modify security configurations, and potentially pivot to other systems connected to the network. The impact is severe because it bypasses standard access controls that rely on user identity separation. Since the exploitation requires existing local access to a specific service account, this vulnerability typically affects scenarios where an attacker has already compromised part of the application stack through prior vulnerabilities or misconfigurations, such as insecure API endpoints or weak authentication mechanisms for backend services.
This type of flaw is categorized under CWE-22: Improper Limitation of a Pathname to a Restricted Directory, which describes situations where software does not properly neutralize special elements within file paths that can resolve to files outside of the intended directory. Additionally, this vulnerability aligns with MITRE ATT&CK technique T1068: Exploitation for Privilege Escalation, specifically involving local exploitation methods. The attacker leverages existing access to execute arbitrary commands as root, which corresponds to the command and script execution capabilities inherent in gaining high-level system privileges.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. Administrators should ensure that Kiteworks appliances are updated to versions where this path handling logic has been corrected by the vendor. In environments where patching is not immediately feasible, strict file permission controls can be implemented to prevent unprivileged service accounts from writing or modifying files in directories accessed by privileged routines. Furthermore, implementing least-privilege principles for backend services ensures that even if one component is compromised, the blast radius remains limited. Application-level input validation should also be enforced to sanitize all filesystem paths before they are passed to system calls, ensuring that only expected and safe directory structures are processed. Regular security audits focusing on file I/O operations in privileged code sections can help identify similar vulnerabilities before they are exploited.