CVE-2026-63142 in Kibana
Summary
by MITRE • 07/22/2026
Incomplete List of Disallowed Inputs (CWE-184) in Kibana can allow an authenticated attacker with access to the Reporting feature to bypass outbound request restrictions configured by an administrator, causing the reporting service to send requests to network destinations that should be denied by the configured security policy.
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Analysis
by VulDB Data Team • 07/22/2026
The vulnerability described represents a critical authorization bypass issue within the Kibana reporting functionality that stems from incomplete input validation mechanisms. This weakness falls under CWE-184, which specifically addresses situations where applications fail to properly validate all potentially dangerous inputs, creating pathways for attackers to circumvent security controls. The flaw exists in how Kibana processes outbound requests when generating reports, particularly within the reporting service component that handles network communications. When administrators configure security policies to restrict outbound connections to specific network destinations, this protection mechanism can be bypassed through carefully crafted inputs that exploit the incomplete validation logic.
The technical implementation of this vulnerability occurs when an authenticated user accesses the Kibana reporting feature and creates a report that includes maliciously constructed input parameters. The reporting service processes these inputs without comprehensive validation against the configured security restrictions, allowing requests to be sent to prohibited network endpoints. This misconfiguration enables attackers to leverage legitimate reporting functionality as a means of exfiltrating data or establishing unauthorized connections to external systems. The vulnerability specifically targets the outbound request filtering mechanism that should prevent communication with blacklisted IP addresses, domains, or ports, but fails to properly validate all input fields used in report generation processes.
From an operational impact perspective, this vulnerability creates significant security risks for organizations relying on Kibana's reporting capabilities. An authenticated attacker can effectively bypass network segmentation policies and corporate firewall rules that are designed to prevent unauthorized external communications. The potential consequences include data exfiltration to malicious servers, command and control communications with compromised systems, or exploitation of other network services through the bypassed restrictions. This vulnerability is particularly concerning because it operates within legitimate administrative functions, making it harder to detect through traditional security monitoring approaches. The attack surface expands significantly when considering that reporting features are often enabled for various user roles, potentially allowing multiple pathways for exploitation.
Organizations should implement immediate mitigations including comprehensive input validation across all report generation parameters and enhanced monitoring of outbound network requests from Kibana instances. Security teams must review and tighten the configuration of network restrictions within their Kibana deployments to ensure that all potential input vectors are properly validated against security policies. The implementation of additional layers of protection such as web application firewalls, network segmentation controls, and behavioral analytics can help detect anomalous outbound communications that may indicate exploitation attempts. This vulnerability demonstrates the importance of following secure coding practices and adhering to defense-in-depth principles, particularly when implementing features that handle external communications. Organizations should also consider applying the principle of least privilege by restricting access to reporting features to only those users who require this functionality for legitimate business purposes, as outlined in various cybersecurity frameworks including the NIST Cybersecurity Framework and MITRE ATT&CK framework's privileged access techniques.