# CVE-2026-72632: Observable Discrepancy in Kibana Fleet Leading to Disclosure of Elastic Agent Elasticsearch API Keys

> CVE-2026-72632: Observable Discrepancy in Kibana Fleet Leading to Disclosure of Elastic Agent Elasticsearch API Keys. CVSS 7.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-72632
Last updated: 2026-09-03T18:38:00Z

- Published: 2026-08-13 19:14 UTC · Updated: 2026-09-03 18:38 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: 0.35%, 28th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-203

## Description

Observable Discrepancy (CWE-203) in Kibana Fleet can lead to information disclosure via Excavation (CAPEC-116). Fleet removes the Elasticsearch API key value of an enrolled Elastic Agent from the responses of its agent listing capability, but that capability accepted caller-supplied filter expressions over the stored field that holds the value, and evaluated them with Kibana's own internal Elasticsearch privileges rather than the caller's. Because the number of matching agents is reported back to the caller, the difference between a matching and a non-matching filter formed a side channel from which the full API key value could be reconstructed one character at a time with a short sequence of requests.

## 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-2026-72632)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-72632)
- [https://discuss.elastic.co/t/kibana-8-19-20-9-4-5-9-5-1-security-update-esa-2026-129/389532](https://discuss.elastic.co/t/kibana-8-19-20-9-4-5-9-5-1-security-update-esa-2026-129/389532)

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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-2026-72632 · Markdown: https://rewindex.com/cve/CVE-2026-72632.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-72632 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:16:54.402Z