What is CVE-2026-26935?

CVE-2026-26935 is a medium-severity vulnerability in Elastic Kibana, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-02-26.

How severe is CVE-2026-26935?

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

Improper input validation in Elastic Kibana

CVE-2026-26935

Improper Input Validation (CWE-20) in the internal Content Connectors search endpoint in Kibana can lead Denial of Service via Input Data Manipulation (CAPEC-153)

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

Published 2026-02-26 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.005 (40.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 40.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002

Affected products

Elastic Kibana — versions 9.3.0, 8.4.0, 9.0.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

discuss.elastic.co/t/kibana-8-19-12-9-2-6-9-3-1-security-update-esa-2026-13/385… (Vendor Advisory)

Frequently asked questions

What is CVE-2026-26935?: CVE-2026-26935 is a medium-severity vulnerability in Elastic Kibana, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-02-26.
How severe is CVE-2026-26935?: Medium severity. CVSS v3 base score is 6.5 out of 10.