CVE-2026-0543 MEDIUM

CVE-2026-0543: Improper Input Validation in Kibana Email Connector Leading to Excessive Allocation

Vendor Elastic
Product Kibana
Weakness CWE-20 · Input validation
Published January 13, 2026
Last update January 13, 2026
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

Improper Input Validation (CWE-20) in Kibana's Email Connector can allow an attacker to cause an Excessive Allocation (CAPEC-130) through a specially crafted email address parameter. This requires an attacker to have authenticated access with view-level privileges sufficient to execute connector actions. The application attempts to process specially crafted email format, resulting in complete service unavailability for all users until manual restart is performed.

Key dates

02Disclosure timeline

January 13, 2026 CVE published
January 13, 2026 Record updated