CVE-2026-42398
Published: 28 May 2026
Summary
CVE-2026-42398 is a high-severity SSRF (CWE-918) vulnerability in Elastic (inferred from references). Its CVSS base score is 7.7 (High).
Operationally, ranked at the 8.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
Deeper analysisAI
Automated synthesis unavailable for this CVE.
Vulnerability
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…
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the egress restriction controls were intended to block.
- CWE(s)
- OWASP Top 10 Web 2025
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-33032
Affected Products
Threat picture
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Defense & controls
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing attempts server-side requests to internal resources, identifying SSRF weaknesses for remediation.
Outbound connections to external resources can be monitored and limited at the boundary, reducing SSRF impact.
Validates server-side URLs and resource references to block SSRF attempts.
Detects server-side request forgery through monitoring of unexpected outbound connections.