# Elasticsearch 8.19.19, 9.3.8, 9.4.4, 9.5.1 Security Update (ESA-2026-143)

**URL:** https://discuss.elastic.co/t/elasticsearch-8-19-19-9-3-8-9-4-4-9-5-1-security-update-esa-2026-143/390094
**Category:** Security Announcements
**Created:** [September 1, 2026, 6:47pm UTC](https://discuss.elastic.co/t/elasticsearch-8-19-19-9-3-8-9-4-4-9-5-1-security-update-esa-2026-143/390094 "2026-09-01T18:47:36Z")
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### Author: ![ismisepaul](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ismisepaul/32/102235_2.png) [@ismisepaul](https://discuss.elastic.co/u/ismisepaul)
#### Post date: [September 1, 2026, 6:47pm UTC](https://discuss.elastic.co/t/elasticsearch-8-19-19-9-3-8-9-4-4-9-5-1-security-update-esa-2026-143/390094/1 "2026-09-01T18:47:36Z")

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**Missing Authorization in Elasticsearch Leading to Information Disclosure**

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.

**Affected Versions:**

> - 8.x: All versions from 8.0.0 up to and including 8.19.18
> - 9.x:

- All versions from 9.0.0 up to and including 9.3.7
- All versions from 9.4.0 up to and including 9.4.3
- Version 9.5.0

**Affected Configurations:**  
Deployments using the custom inference service type with secret-backed configuration, where users are granted inference execution privileges.

**Solutions and Mitigations:**

The issue is resolved in Elasticsearch versions 8.19.19, 9.3.8, 9.4.4, and 9.5.1.

**For Users that Cannot Upgrade:**

There are no workarounds for this vulnerability.

**Indicators of Compromise (IOC)**

No specific indicators of compromise have been identified for this vulnerability.

**Elastic Cloud Serverless**

Due to our continuous deployment and patching model, the vulnerability described in this security advisory was remediated in our Elastic Cloud Serverless offering before the public disclosure.

**Severity:** CVSSv3.1: Medium ( 5.4 ) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N  
**CVE ID:** CVE-2026-78607  
**Problem Type:** CWE-862 - Missing Authorization  
**Impact:** CAPEC-122 - Privilege Abuse

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