CVE-2026-42398 Server-Side Request Forgery (SSRF) in Kibana Leading to Unauthorized Network Access
Authenticated users with connector privileges can bypass egress restrictions to access unauthorized internal network resources via crafted Webhook connectors.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42398?
CVE-2026-42398 is a high-severity server-side request forgery vulnerability in Elastic Kibana, published on 28 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Server-Side Request Forgery (CWE-918) in Kibana allows authenticated users with connector management privileges to bypass the operator-configured connection allowlist. By configuring a Webhook connector with a crafted target, an attacker can cause Kibana to issue outbound requests to destinations that the egress restriction controls were intended to block.
Weakness: CWE-918
Which versions are affected by CVE-2026-42398?
2 open source packages ship an affected version, including kibana and elk. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
kibana Bitnami | From 9.0.0 | 9.2.8, 9.3.2 |
elk Bitnami | From 9.0.0 | 9.2.8, 9.3.2 |
Products include Elastic Kibana.
How do I fix CVE-2026-42398?
Upgrade kibana to a fixed version for your release line: 9.2.8 or 9.3.2.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-42398 being exploited?
There is no known exploitation of CVE-2026-42398 in the wild and no public exploit code.
Other vulnerabilities in Elastic Kibana
Sources
Also known as BIT-elk-2026-42398, BIT-kibana-2026-42398, GHSA-43ww-gwmw-f89v, MINI-8ch5-7g43-42cw, MINI-9q5p-qvwq-mg9p, MINI-cx7g-f83h-w58p and 1 more.