Kibana Email Connector CVE-2026-0543: Improper Input Validation (CWE-20)
CVE-2026-0543 Published on January 13, 2026
Improper Input Validation in Kibana Email Connector Leading to Excessive Allocation
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.
Vulnerability Analysis
CVE-2026-0543 can be exploited 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 no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Products Associated with CVE-2026-0543
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Affected Versions
Elastic Kibana:- Version 8.0.0, <= 8.19.9 is affected.
- Version 7.0.0, <= 7.17.29 is affected.
- Version 9.0.0, <= 9.1.9 is affected.
- Version 9.2.0, <= 9.2.3 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.