Server-Side Request Forgery (SSRF) in Kibana - CVE-2026-42398
Published: May 29, 2026
Vulnerability identifier: #VU132765
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-42398
CWE-ID: CWE-918
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Elastic Stack
Affected software:
Kibana
Kibana
Detailed vulnerability description
The vulnerability allows a remote user to access unauthorized network destinations.
The vulnerability exists due to server-side request forgery in Webhook connector handling when configuring a crafted target. A remote user can configure a Webhook connector with a crafted target to access unauthorized network destinations.
Only deployments where the xpack.actions.allowedHosts setting is configured to restrict outbound connector connections are affected.
How to mitigate CVE-2026-42398
Install security update from vendor's website.