# Kibana 8.19.12, 9.2.6, 9.3.1 Security Update (ESA-2026-13)

**URL:** <https://discuss.elastic.co/t/kibana-8-19-12-9-2-6-9-3-1-security-update-esa-2026-13/385249>\
**Category:** Security Announcements\
**Created:** [February 26, 2026, 4:53pm UTC](https://discuss.elastic.co/t/kibana-8-19-12-9-2-6-9-3-1-security-update-esa-2026-13/385249 "2026-02-26T16:53:12Z")\
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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:** [February 26, 2026, 4:53pm UTC](https://discuss.elastic.co/t/kibana-8-19-12-9-2-6-9-3-1-security-update-esa-2026-13/385249/1 "2026-02-26T16:53:12Z")

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**Improper Input Validation in Kibana Leading to Denial of Service**

Improper Input Validation (CWE-20) in the internal Content Connectors search endpoint in Kibana can lead Denial of Service via Input Data Manipulation (CAPEC-153)

**Affected Versions:**

- 8.x: All versions from 8.4.0 up to and including 8.19.11
- 9.x:
  - All versions from 9.0.0 up to and including 9.2.5
  - Version 9.3.0

**Affected Configurations:**  
Users that have not configured Content Connectors are not affected by this vulnerability, as the vulnerable endpoint is only accessible when connectors exist in the deployment.

**Solutions and Mitigations:**

The issue is resolved in version 8.19.12, 9.2.6, 9.3.1.

**For Users that Cannot Upgrade:**

Restrict Access to Content Connectors:  
Modify user roles to remove access to the Content Connectors feature for users who do not require it. This can be accomplished by:

- Creating custom roles that exclude Kibana privileges for Content Connectors
- Removing the viewer role from users who do not need Content Connectors access
- Implementing more granular feature-level privileges

**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 ( 6.5 ) -CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H  
**CVE ID** : CVE-2026-26935  
**Problem Type:** CWE-20 - Improper Input Validation  
**Impact:** CAPEC-153 - Input Data Manipulation

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_[View the full topic](https://discuss.elastic.co/t/kibana-8-19-12-9-2-6-9-3-1-security-update-esa-2026-13/385249)._