CVE-2026-42398

Name: CVE-2026-42398
Creator: NVD / NIST
Published: 2026-05-28T21:16:30.18+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.7/10EPSS 0.27%

Last modified Jun 17, 2026

CVE-2026-42398 is a high-severity vulnerability rated 7.7/10 on the CVSS scale. 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.. EPSS estimates a 0.27% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.7/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS Probability

0.27%

18.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-918

Affected Software

Vendor	Product	Versions
Elastic	Kibana	>= 9.0.0, < 9.2.8
Elastic	Kibana	>= 9.3.0, < 9.3.2

References

https://discuss.elastic.co/t/kibana-9-2-8-and-9-3-2-security-update-esa-2026-37/386557Vendor Advisory

Timeline

Published: May 28, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-42398?

How severe is CVE-2026-42398?

CVE-2026-42398 has a CVSS score of 7.7/10 (HIGH severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.

How do I fix CVE-2026-42398?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-42398?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST