# CVE-2026-72643: Incorrect Authorization in Kibana Agent Builder Leading to Disclosure and Tampering of Private Agents

> CVE-2026-72643: Incorrect Authorization in Kibana Agent Builder Leading to Disclosure and Tampering of Private Agents. CVSS 7.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-72643
Last updated: 2026-09-03T18:56:46Z

- Published: 2026-08-13 19:13 UTC · Updated: 2026-09-03 18:56 UTC · Assigner: elastic
- CVSS: 7.1 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
- EPSS: 0.38%, 31th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-863

## Description

Kibana Agent Builder determines whether a caller owns a private agent by comparing a stable user identifier when one is recorded, and falling back to a comparison of the username when it is not. A username is not unique across Elasticsearch authentication realms, so two distinct principals that share a username in different realms are treated as the same owner. This discloses the configuration and instructions of an agent the caller does not own, and allows that agent to be altered or removed.

## Affected vendors and products

- Elastic: Kibana

## Tracked companies

- [Elastic Cloud](https://rewindex.com/company/elastic-cloud.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-72643)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-72643)
- [https://discuss.elastic.co/t/kibana-9-4-5-9-5-1-security-update-esa-2026-124/389538](https://discuss.elastic.co/t/kibana-9-4-5-9-5-1-security-update-esa-2026-124/389538)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-72643 · Markdown: https://rewindex.com/cve/CVE-2026-72643.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-72643 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:47.196Z