What is CVE-2026-0543?

CVE-2026-0543 is a medium-severity vulnerability in Elastic Kibana, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-01-13.

How severe is CVE-2026-0543?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Elastic Kibana

CVE-2026-0543

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 w…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.004 (28.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Elastic Kibana — versions 8.0.0, 7.0.0, 9.0.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation
CWE-770 — Allocation of Resources Without Limits or Throttling

References

security@elastic.co (Vendor Advisory)

Frequently asked questions

What is CVE-2026-0543?: CVE-2026-0543 is a medium-severity vulnerability in Elastic Kibana, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-01-13.
How severe is CVE-2026-0543?: Medium severity. CVSS v3 base score is 6.5 out of 10.