CVE-2026-63262: 
Kibana vulnerability analysis and mitigation

CVE-2026-63262 is a Missing Authorization vulnerability (CWE-862) in Elastic Kibana that enables unauthorized cross-space information disclosure. An authenticated low-privileged user can supply crafted input to circumvent Kibana's space-level access controls and read data from spaces they are not permitted to access. The vulnerability affects Kibana versions 9.4.0 through 9.4.3 and was published on July 22, 2026. It carries a CVSS v3.1 base score of 4.3 (Medium) (GitHub Advisory, Elastic Advisory).

The root cause is classified as CWE-862 (Missing Authorization): Kibana fails to perform adequate authorization checks when processing user-supplied input that references resources across different spaces. Kibana's "Spaces" feature is designed to isolate data and dashboards between organizational units, but the missing authorization check allows an attacker to craft requests that bypass this isolation boundary. The attack vector is network-based, requires low privileges (an authenticated account), low attack complexity, and no user interaction, making it straightforward to exploit for any authenticated user (GitHub Advisory, Elastic Advisory).

Successful exploitation allows an authenticated attacker with low privileges to read information from Kibana spaces they are not authorized to access, resulting in unauthorized cross-space information disclosure. The confidentiality impact is rated Low (partial data exposure), with no impact to integrity or availability. While the vulnerability does not enable code execution or data modification, it could expose sensitive dashboards, saved objects, or indexed data belonging to other organizational units within the same Kibana deployment (GitHub Advisory, Elastic Advisory).

There is no public proof-of-concept exploit code and no evidence of in-the-wild exploitation at this time (Feedly). The EPSS score is approximately 0.162–0.166%, placing it in the 6th percentile for exploitation likelihood within 30 days. The NVD SSVC assessment confirms exploitation is "none" and the attack is not automatable. CVE-2026-63262 is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog (GitHub Advisory).

Elastic has released Kibana version 9.4.4 to address this vulnerability; users running versions 9.4.0 through 9.4.3 should upgrade immediately (Elastic Advisory). As an interim measure, administrators should audit space-level permissions for all users and restrict access to Kibana to only trusted, authenticated users. Implementing additional network-level access controls (e.g., firewall rules limiting Kibana exposure) can reduce the attack surface until patching is complete.

Elastic published a security advisory (ESA-2026-73) alongside the Kibana 9.4.4 release detailing the fix (Elastic Advisory). Tenable issued a detection plugin (Nessus plugin 330364) for the vulnerability. Coverage has been limited to standard vulnerability aggregators and security databases, with no notable researcher commentary or significant social media discussion observed.