# Kibana 8.19.16, 9.3.5 Security Update (ESA-2026-33)

**URL:** https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-security-update-esa-2026-33/386551
**Category:** Security Announcements
**Created:** [May 28, 2026, 7:24pm UTC](https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-security-update-esa-2026-33/386551 "2026-05-28T19:24:46Z")
**Posts on this page:** 1
**Page:** 1

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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: [May 28, 2026, 7:24pm UTC](https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-security-update-esa-2026-33/386551/1 "2026-05-28T19:24:46Z")

</div>

**Operation on a Resource after Expiration or Termination in Kibana Leading to Unauthorized File Access**

Operation on a Resource after Expiration or Termination (CWE-672) in Kibana can lead to unauthorized information disclosure. A logic error in how expiration timestamps were validated allowed a time-bounded access token to remain usable beyond its intended validity window, enabling an unauthenticated actor in possession of the token to retrieve the associated content after expiration.

**Affected Versions:**

- 8.x: All versions from 8.0.0 up to and including 8.19.15
- 9.x: All versions from 9.0.0 up to and including 9.3.4

**Affected Configurations:**

- Kibana deployments that make use of the public file sharing feature to issue time-bounded download links are affected. Deployments that do not issue public share tokens are not impacted.

**Solutions and Mitigations:**

The issue is resolved in Kibana versions **8.19.16, 9.3.5.**

**For Users that Cannot Upgrade:**

- Revoke any active public file share tokens and avoid issuing new public shares until the upgrade has been applied.
- Where feasible, restrict access to file-sharing functionality to trusted administrators only.

**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 ( 5.3 ) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N  
**CVE ID:** CVE-2026-33463  
**Problem Type:** CWE-672 - Operation on a Resource after Expiration or Termination