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CVE-2025-37731

Good to know:

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Date: December 15, 2025

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.

Severity Score

Related Resources (3)

https://nvd.nist.gov/vuln/detail/CVE-2025-37731
https://discuss.elastic.co/t/elasticsearch-8-19-8-9-1-8-and-9-2-2-security-update-esa-2025-27/384063
https://www.mend.io/vulnerability-database/CVE-2025-37731

Severity Score

Weakness Type (CWE)

Improper Authentication

CWE-287

Top Fix

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Upgrade Version

Upgrade to version org.elasticsearch.plugin:x-pack-security:8.19.7;org.elasticsearch.plugin:x-pack-security:9.1.7;org.elasticsearch.plugin:x-pack-security:9.2.1;https://github.com/elastic/elasticsearch.git - v8.19.7;https://github.com/elastic/elasticsearch.git - v9.1.7;https://github.com/elastic/elasticsearch.git - v9.2.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): NONE

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