CVE-2026-0528 is classified as a medium-severity vulnerability affecting Elastic Kibana. This vulnerability allows an attacker to cause a Denial of Service (DoS) through improper validation of array indexes and input data manipulation. Attackers can exploit the vulnerability by sending specially crafted, malformed payloads to the Graphite server metricset or Zookeeper server metricset in Metricbeat. Additionally, improper input validation exists in the Prometheus helper module, which can also lead to a DoS through similar means.
The severity of this vulnerability, as assessed by the CVSS scoring system, is 6.5, indicating a medium level of risk. This score is derived from factors such as the attack vector, which is adjacent network, and the potential high impact on availability. Organizations should assess their exposure to this vulnerability, especially if they utilize Kibana in their environments.
Given the potential impact on availability, organizations should prioritize patching this vulnerability promptly to prevent any denial of service incidents. Immediate remediation is essential to maintaining the integrity and availability of systems reliant on Kibana.
The vulnerability was published on January 13, 2026. Organizations using vulnerable versions of Kibana should implement updates or mitigations to safeguard against potential exploitation.
Vulnerability Details
The CVE-2026-0528 vulnerability stems from improper validation of array indexes (CWE-129) in Metricbeat. This flaw allows attackers to manipulate input data effectively. Furthermore, improper input validation (CWE-20) in the Prometheus helper module enhances the potential for denial of service through specifically crafted metric data. The CVSS score of 6.5 reflects the medium severity of the vulnerability, indicating that while exploitation is feasible, it requires specific conditions and capabilities.
The affected product, Kibana, is a widely used analytics and visualization platform. The vulnerability affects all versions prior to the vendor patch, specifically versions 7.0.0 to 7.17.29, 8.0.0 to 8.19.10, 9.0.0 to 9.1.10, and 9.2.0 to 9.2.4.
Technical Analysis
The root cause of this vulnerability lies in the improper handling of array indices, which allows attackers to craft payloads that can exploit the system by manipulating the expected data format. The attack vector is adjacent network, meaning that an attacker must be on the same network to exploit the vulnerability. The attack complexity is classified as low, indicating that the exploitation does not require extensive technical knowledge.
No privileges are required for executing this attack, and user interaction is not necessary, making it easier for attackers to exploit the vulnerability. Furthermore, the attack can significantly impact availability, leading to potential downtime for services relying on Kibana.
Risk & Impact Analysis
Risk to organizations includes potential downtime and loss of service availability due to denial of service attacks. The blast radius could extend to any services integrated with Kibana, leading to broader impacts on business operations. The urgency for organizations to address this vulnerability is categorized as medium, considering the CVSS score and the availability impact.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of Kibana prior to vendor patch are affected, specifically versions 7.0.0 to 7.17.29, 8.0.0 to 8.19.10, 9.0.0 to 9.1.10, and 9.2.0 to 9.2.4. Organizations running these versions should take immediate steps to upgrade.
Mitigation & Remediation
Organizations should prioritize patching Kibana to remediate this vulnerability. Ensure that your systems are updated to versions beyond the vulnerable ranges mentioned earlier. If patches are unavailable, consider implementing network controls to limit access to Kibana and monitor for anomalous activity. Regular security assessments, including penetration testing, can help identify additional vulnerabilities within your environment.
Detection Guidance
Monitor logs for any unusual patterns or spikes in activity targeting Kibana. Look for indicators of attempts to send malformed payloads, which may suggest an ongoing exploitation attempt. Behavioral anomalies, such as unexpected service restarts or performance degradation, should also be investigated.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2026-0528 lies in its reflection of the ongoing challenges in ensuring robust input validation across software components. This vulnerability exemplifies the necessity for security teams to adopt comprehensive security practices that include proactive testing and continuous monitoring. Organizations should take this opportunity to review their security posture and implement practices that prioritize security from the development stage onward. For more information on enhancing your security framework, consider reviewing our penetration testing methodology and other resources.
Additionally, exploring the trends represented by vulnerabilities like CVE-2026-0528 can provide valuable lessons for security teams. Recognizing patterns in vulnerabilities can aid in prioritizing security efforts and resource allocation. For further insights, refer to our article on vulnerability management programs which can enhance your approach to managing security risks.
Lastly, organizations should consider the importance of comprehensive incident response planning. Preparing for potential exploitation of vulnerabilities such as CVE-2026-0528 can significantly reduce downtime and impact on business operations. Understanding how to respond effectively can make a difference in the event of a security incident.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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