Kibana SSRF Auth Users Bypass Egress Allowlist via Webhook Connector
CVE-2026-42398 Published on May 28, 2026
Server-Side Request Forgery (SSRF) in Kibana Leading to Unauthorized Network Access
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.
Vulnerability Analysis
CVE-2026-42398 is exploitable with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Type
What is a SSRF Vulnerability?
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.
CVE-2026-42398 has been classified to as a SSRF vulnerability or weakness.
Products Associated with CVE-2026-42398
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Affected Versions
Elastic Kibana:- Version 9.3.0, <= 9.3.1 is affected.
- Version 9.0.0, <= 9.2.7 is affected.