# Kibana 8.19.21, 9.4.6, 9.5.3 Security Update (ESA-2026-174)

**URL:** https://discuss.elastic.co/t/kibana-8-19-21-9-4-6-9-5-3-security-update-esa-2026-174/390162
**Category:** Security Announcements
**Created:** [September 3, 2026, 6:02pm UTC](https://discuss.elastic.co/t/kibana-8-19-21-9-4-6-9-5-3-security-update-esa-2026-174/390162 "2026-09-03T18:02:39Z")
**Posts on this page:** 1
**Showing post:** 1

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### Author: ![Bryan\_Garcia](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/bryan_garcia/32/148179_2.png) [@Bryan\_Garcia](https://discuss.elastic.co/u/Bryan_Garcia)
#### Post date: [September 3, 2026, 6:02pm UTC](https://discuss.elastic.co/t/kibana-8-19-21-9-4-6-9-5-3-security-update-esa-2026-174/390162/1 "2026-09-03T18:02:39Z")

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**Incorrect Authorization in Kibana Leading to Denial of Service**

Incorrect Authorization (CWE-863) in Kibana can lead to denial of service via Exploiting Incorrectly Configured Access Control Security Levels (CAPEC-180).

**Affected Versions:**

- 8.x: All versions from 8.0.0 up to and including 8.19.20
- 9.x:
  - All versions from 9.0.0 up to and including 9.4.5
  - All versions from 9.5.0 up to and including 9.5.2

**Affected Configurations:**  
All configurations with Fleet and agent communication message signing enabled.

**Solutions and Mitigations:**

The issue is resolved in versions 8.19.21, 9.4.6, 9.5.3.

**For Users that Cannot Upgrade:**

There are no workarounds 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 ( 4.3 ) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L  
**CVE ID:** CVE-2026-82298  
**Problem Type:** CWE-863 - Incorrect Authorization  
**Impact:** CAPEC-180 - Exploiting Incorrectly Configured Access Control Security Levels

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_[View the full topic](https://discuss.elastic.co/t/kibana-8-19-21-9-4-6-9-5-3-security-update-esa-2026-174/390162)._