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Medium severity · published Jan 13, 2026
CVE-2026-0543
Improper Input Validation in Kibana Email Connector Leading to Excessive Allocation
6.5
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KI
Kibana · Elastic
8.0.0 through 8.19.9; 7.0.0 through 7.17.29; 9.0.0 through 9.1.9; 9.2.0 through 9.2.3 · source: vendor, NVD
Affected product
KI
Kibana
Elastic
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-0543
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-0543
Vendor Advisory
https://discuss.elastic.co/t/kibana-8-19-10-9-1-10-9-2-4-security-update-esa-2026-08/384523
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