What is CVE-2026-42398?

CVE-2026-42398 is a high-severity vulnerability in Elastic Kibana, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-05-28.

How severe is CVE-2026-42398?

High severity. CVSS v3 base score is 7.7 out of 10.

SSRF in Elastic Kibana

CVE-2026-42398

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 c…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.000 (10.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

Affected products

Elastic Kibana — versions 9.3.0, 9.0.0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

security@elastic.co (Vendor Advisory)

Frequently asked questions

What is CVE-2026-42398?: CVE-2026-42398 is a high-severity vulnerability in Elastic Kibana, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.7/10. Published 2026-05-28.
How severe is CVE-2026-42398?: High severity. CVSS v3 base score is 7.7 out of 10.