# Kibana 8.19.17, 9.3.6, 9.4.3 Security Update (ESA-2026-159)

**URL:** <https://discuss.elastic.co/t/kibana-8-19-17-9-3-6-9-4-3-security-update-esa-2026-159/390114>\
**Category:** Security Announcements\
**Created:** [September 1, 2026, 10:35pm UTC](https://discuss.elastic.co/t/kibana-8-19-17-9-3-6-9-4-3-security-update-esa-2026-159/390114 "2026-09-01T22:35:10Z")\
**Posts on this page:** 1\
**Page:** 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 1, 2026, 10:35pm UTC](https://discuss.elastic.co/t/kibana-8-19-17-9-3-6-9-4-3-security-update-esa-2026-159/390114/1 "2026-09-01T22:35:10Z")

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**Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in Kibana Leading to Unauthorized Resource Deletion**

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (CWE-22) in the Kibana Fleet feature can lead to the unauthorized deletion of resources via Path Traversal (CAPEC-126). A low-privileged user could cause a subsequent action taken by a higher-privileged user in the Fleet administration interface to act on an unintended target, resulting in the deletion of resources including accounts with elevated privileges.

**Affected Versions:**

- 8.x: All versions from 8.0.0 up to and including 8.19.16
- 9.x:
  - All versions from 9.0.0 up to and including 9.3.5
  - All versions from 9.4.0 up to and including 9.4.2

**Affected Configurations:**

Kibana deployments with Fleet enabled where users of differing privilege levels both have access to Fleet configuration.

**Solutions and Mitigations:**  
The issue is resolved in Kibana versions 8.19.17, 9.3.6, and 9.4.3.

**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 ( 6.3 ) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:L  
**CVE ID:** CVE-2026-78591  
**Problem Type:** CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')  
**Impact:** CAPEC-126 - Path Traversal