CVE-2026-82298: 
Kibana vulnerability analysis and mitigation

CVE-2026-82298 is an Incorrect Authorization vulnerability (CWE-863) in Elastic Kibana that can lead to denial of service by exploiting incorrectly configured access control security levels (CAPEC-180). It was published on September 3, 2026, and affects Kibana versions 8.0.0 through 8.19.20, 9.0.0 through 9.4.5, and 9.5.0 through 9.5.2. The vulnerability carries a CVSS v3.1 base score of 4.3 (Medium) (GitHub Advisory, Elastic Forum).

The root cause is Incorrect Authorization (CWE-863), where Kibana does not correctly perform authorization checks when an actor attempts to access a resource or perform an action, enabling exploitation via misconfigured access control security levels. An authenticated, low-privileged attacker can send network requests that bypass proper authorization enforcement, triggering degraded availability of the Kibana service. No special configuration or user interaction is required beyond possessing a low-privilege account with network access to the Kibana instance (GitHub Advisory, Elastic Forum).

Successful exploitation allows any authenticated user with low-level privileges to cause denial of service conditions against the Kibana service, resulting in degraded or disrupted availability. There is no impact to confidentiality or data integrity, and the scope of impact is limited to the Kibana component itself without lateral movement potential. Organizations relying on Kibana for operational dashboards, log analysis, or security monitoring may experience service disruption (GitHub Advisory).

There is no public proof-of-concept exploit and no evidence of in-the-wild exploitation at this time. The NVD SSVC assessment classifies exploitation as "none" and the attack as non-automatable. The EPSS score is approximately 0.195% (9th percentile), indicating a low probability of exploitation within the next 30 days. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog (GitHub Advisory).

Elastic has released patched versions addressing this vulnerability: Kibana 8.19.21, 9.4.6, and 9.5.3. Users should upgrade to one of these fixed versions as the primary remediation. Additionally, administrators should review and properly configure access control security levels to enforce the principle of least privilege, and audit user roles and permissions to ensure they are appropriately restricted (Elastic Forum, GitHub Advisory).