Missing Authorization in Elasticsearch - CVE-2026-78607
Published: September 1, 2026
Vulnerability identifier: #VU146655
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-78607
CWE-ID: CWE-862
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to missing authorization in the Elasticsearch custom inference service when handling inference execution requests. A remote user can direct outbound inference traffic to a destination of their choosing to disclose sensitive information.
Only deployments using the custom inference service type with secret-backed configuration are vulnerable.
Affected software
Elasticsearch
How to mitigate CVE-2026-78607
Install security update from vendor's website.
Elasticsearch - addressed in versions 8.19.19, 9.3.8, 9.4.4, 9.5.1