CVE-2026-102136 in Kiteworks
Summary
by MITRE • 10/01/2026
In multi-node deployments, an attacker who had already obtained code execution on one appliance node could submit a value through an internal cluster interface that was written into monitoring configuration on another node without sufficient validation, potentially allowing OS commands to be executed there. Execution was limited to an unprivileged service account on that node.
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Analysis
by VulDB Data Team • 10/01/2026
The vulnerability described represents a classic instance of lateral movement facilitated by insufficient input validation within clustered infrastructure components. In multi-node deployments, appliances often communicate over internal cluster interfaces to synchronize state and configuration data. The core technical flaw lies in the processing of values submitted through these internal channels, specifically those intended for monitoring configurations on remote nodes. When an attacker achieves initial code execution on one appliance node, they can exploit this trust relationship by crafting malicious payloads that are transmitted via the internal interface. Because the receiving node fails to perform adequate validation or sanitization on the incoming data before writing it into its configuration files, the system inadvertently processes these inputs as executable commands rather than static configuration parameters. This lack of boundary enforcement between administrative interfaces and operational services creates a critical security gap where trusted network segments are exploited to propagate malicious activity across the cluster topology.
From an operational impact perspective, this vulnerability allows for privilege escalation in terms of scope rather than user rights, as execution is limited to an unprivileged service account on the target node. While the attacker does not gain root or administrator privileges directly through this specific flaw, achieving code execution under a service account provides significant foothold advantages. Service accounts often possess elevated permissions relative to standard users and may have access to sensitive system resources, logs, or internal APIs that are otherwise restricted. This capability enables the attacker to pivot further into the network, potentially accessing other services running on the compromised node or using it as a staging ground for attacks against higher-value targets within the cluster. The ability to execute commands remotely via configuration injection effectively neutralizes many perimeter defenses designed to protect individual nodes in isolation, turning the redundancy and connectivity features of multi-node systems into vectors for widespread compromise.
This vulnerability aligns with CWE-20 Improper Input Validation, as the root cause is the failure to verify that incoming data conforms to expected formats or constraints before processing it within a security-sensitive context. Furthermore, the attack vector corresponds to MITRE ATT&CK technique T1570 Lateral Tool Transfer if used for deploying additional malware, but more accurately maps to T1210 Exploitation of Remote Services when considering the exploitation of the cluster interface itself. The scenario also reflects aspects of T1098 Authorized Impersonation or Account Manipulation in a broader sense, as the attacker leverages legitimate service accounts and internal communication protocols to bypass authentication controls that would otherwise prevent such actions from external sources. Understanding these mappings helps security teams contextualize the risk within established threat models and prioritize remediation efforts based on known adversary behaviors associated with cluster-based environments.
Mitigation strategies should focus on implementing strict input validation and sanitization routines for all data received through internal cluster interfaces, regardless of the perceived trustworthiness of the source IP or network segment. Developers must ensure that configuration parameters are treated as immutable strings unless explicitly defined otherwise by a secure schema, preventing command injection via special characters or escape sequences. Additionally, adopting a principle of least privilege is critical; service accounts should be restricted to only the minimum permissions necessary for their specific functions, thereby limiting the impact if such an account is compromised. Network segmentation and micro-segmentation can also reduce risk by restricting communication between nodes to essential ports and protocols, making it harder for attackers to exploit internal interfaces even after gaining initial access. Regular security audits of cluster configuration management processes and automated testing for injection vulnerabilities in these specific code paths are recommended to detect and remediate such flaws before they can be exploited in production environments.