CVE-2026-72632
Received Received - Intake

Information Disclosure in Kibana Fleet via Observable Discrepancy

Publication date: 2026-08-13

Last updated on: 2026-08-13

Assigner: Elastic

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.

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Meta Information

Published
2026-08-13
Last Modified
2026-08-13
Generated
2026-08-14
AI Q&A
2026-08-13
EPSS Evaluated
N/A
NVD
CVE-2026-72632
EUVD
EUVD-2026-58221

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
elastic kibana *
elastic kibana From 8.19.0 (inc) to 8.19.19 (inc)
elastic kibana From 9.0.0 (inc) to 9.4.4 (inc)
elastic kibana From 9.5.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-203 The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.

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Executive Summary

CVE-2026-72632 is an Observable Discrepancy vulnerability in Kibana Fleet that allows information disclosure. Fleet removes API key values from responses but still processes filter expressions on stored fields containing these keys. This creates a side channel where the number of matching agents reveals the API key one character at a time through repeated requests.

Detection Guidance

Check Kibana version with: curl -XGET 'http://localhost:5601/api/console/api_server?path=info&method=GET'. If running versions 8.19.0-8.19.19, 9.0.0-9.4.4, or 9.5.0, the system is vulnerable.

Impact Analysis

This vulnerability could allow attackers to reconstruct Elastic Agent Elasticsearch API keys by exploiting side channels in agent listing responses. Compromised API keys may grant unauthorized access to Elasticsearch data or operations, leading to data breaches or unauthorized system control.

Compliance Impact

This vulnerability could lead to unauthorized disclosure of sensitive Elasticsearch API keys used by Elastic Agents. For GDPR, this may constitute a breach of confidentiality requirements under Article 32 (security of processing) if the keys grant access to personal data. Under HIPAA, exposure of API keys could potentially violate the Security Rule's integrity and confidentiality safeguards for protected health information.

Mitigation Strategies

Upgrade Kibana to versions 8.19.20, 9.4.5, or 9.5.1 immediately. If unable to upgrade, isolate affected systems and monitor for suspicious API key enumeration attempts.

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