CVE-2026-26935 in Kibana
Summary
by MITRE • 02/26/2026
Improper Input Validation (CWE-20) in the internal Content Connectors search endpoint in Kibana can lead Denial of Service via Input Data Manipulation (CAPEC-153)
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 03/03/2026
The vulnerability identified as CVE-2026-26935 represents a critical weakness in Kibana's internal Content Connectors search endpoint that stems from improper input validation practices. This flaw falls under the well-documented CWE-20 category, which specifically addresses issues related to insufficient validation of input data. The vulnerability manifests when the search endpoint fails to adequately sanitize or validate user-supplied input parameters, creating a potential attack surface that adversaries can exploit to disrupt system operations. The affected component within Kibana's architecture is the Content Connectors functionality, which serves as an integral part of the platform's data integration and retrieval capabilities.
The technical implementation of this vulnerability allows malicious actors to manipulate input data submitted to the search endpoint in ways that can cause the system to consume excessive computational resources or enter unstable states. When improperly validated input reaches the backend processing logic, it can trigger cascading failures that prevent legitimate users from accessing the search functionality. This particular variant of the vulnerability maps directly to CAPEC-153, which describes how attackers can leverage input manipulation techniques to achieve denial of service outcomes. The flaw likely involves inadequate sanitization of query parameters, path traversal attempts, or malformed data structures that the system cannot properly handle during processing.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the overall stability and availability of Kibana instances within enterprise environments. Organizations relying on Kibana for log analysis, monitoring, and data visualization may experience complete unavailability of search capabilities, forcing operational teams to either restart services or implement temporary workarounds. The denial of service condition can be particularly damaging in security operations centers where real-time data access is critical for threat detection and incident response activities. System administrators may observe increased resource utilization, application crashes, or complete service outages that can persist until the underlying input validation issues are addressed through patches or configuration changes.
Mitigation strategies for CVE-2026-26935 should prioritize immediate implementation of robust input validation measures within the Content Connectors search endpoint. Organizations should implement comprehensive data sanitization routines that validate all incoming parameters against predefined schemas and acceptable value ranges. The fix should incorporate proper error handling mechanisms that gracefully manage malformed inputs rather than allowing them to propagate through the system. Security teams should consider implementing rate limiting and input length restrictions as additional protective measures. The remediation approach should align with established security frameworks and best practices, including the implementation of principle of least privilege access controls and regular security assessments. Organizations must also establish monitoring protocols to detect anomalous input patterns that could indicate exploitation attempts, ensuring that security controls remain effective against evolving attack vectors.