CVE-2026-78607
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Missing Authorization in Elasticsearch Custom Inference Service Leads to Information Disclosure

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: Elastic

Description
Missing Authorization (CWE-862) in the Elasticsearch custom inference service can lead to information disclosure via Privilege Abuse (CAPEC-122). A user holding only inference execution privileges could cause outbound inference traffic to be directed to a destination of their choosing and could cause administrator-provisioned credentials to be exposed.

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Meta Information

Published
2026-09-01
Last Modified
2026-09-01
Generated
2026-09-02
AI Q&A
2026-09-01
EPSS Evaluated
N/A
NVD
CVE-2026-78607
EUVD
EUVD-2026-69570

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
elastic elasticsearch to 8.19.19 (exc)
elastic elasticsearch to 9.3.8 (exc)
elastic elasticsearch From 9.4.0 (inc) to 9.4.4 (exc)
elastic elasticsearch to 9.5.1 (exc)
elastic elasticsearch *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

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Executive Summary

CVE-2026-78607 is a Missing Authorization vulnerability in Elasticsearch's custom inference service. It allows users with only inference execution privileges to redirect outbound inference traffic to a destination of their choice and expose administrator-provisioned credentials.

Detection Guidance

To detect this vulnerability, check if your Elasticsearch deployment uses the custom inference service with secret-backed configurations and if users have inference execution privileges. Verify the Elasticsearch version against affected releases (8.19.18 and earlier in 8.x, 9.3.7 and earlier in 9.x, including 9.4.0-9.4.3 and 9.5.0).

Commands to check version: curl -XGET 'http://localhost:9200' or check logs for version info. Review user privileges for inference execution access.

Impact Analysis

This vulnerability could lead to information disclosure. An attacker with limited privileges might access sensitive data by redirecting traffic or stealing credentials, potentially affecting data confidentiality and system integrity.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, which may violate compliance requirements under GDPR (e.g., unauthorized data processing or disclosure) and HIPAA (e.g., unauthorized access to protected health information). Exposure of administrator-provisioned credentials further increases the risk of non-compliance with data protection regulations.

Mitigation Strategies

Upgrade Elasticsearch to a patched version: 8.19.19, 9.3.8, 9.4.4, or 9.5.1. If upgrading is not possible, disable the custom inference service or restrict inference execution privileges to trusted users.

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