Elasticsearch 8.19.8, 9.1.8, and 9.2.2 Security Update (ESA-2025-27)

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Elasticsearch Improper Authentication (ESA-2025-27)

Improper Authentication in Elasticsearch PKI realm can lead to user impersonation via specially crafted client certificates. A malicious actor would need to have such a crafted client certificate signed by a legitimate, trusted Certificate Authority.

Affected Versions:

  • 7.x All versions
  • 8.x: All versions from 8.0.0 up to and including 8.19.7
  • 9.x
    • All versions from 9.0.0 up to and including 9.1.7
    • All versions from 9.2.0 up to and including 9.2.1

Affected Configurations:

This issue only affects the PKI realm of Elasticsearch.

Solutions and Mitigations:

Medium or High Severity with few customers impacted: The issue is resolved in version 8.19.8, 9.1.8, and 9.2.2.

For Users that Cannot Upgrade:

There are no workarounds

Severity: CVSSv3.1: 6.8 (Medium) - AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

CVE ID: CVE-2025-37731