CVE-2026-26935Network attack vector

Authenticated denial of service via malformed search input

Published Feb 26, 2026 · Updated Feb 26, 2026

Improper input validation in Kibana 8.4.0 through 8.19.11, 9.0.0 through 9.2.5, and 9.3.0 allows remote authenticated users to interrupt service. The internal Content Connectors search endpoint accepts manipulated input without adequate validation, but Elastic has not disclosed the offending field or processing operation. A low-privileged account and at least one configured Content Connector are required; successful requests interrupt availability without reported data access or modification.

CVSS severity6.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Kibana 8.4.0 through 8.19.11, 9.0.0 through 9.2.5, and 9.3.0 allows remote authenticated users to interrupt service. The internal Content Connectors search endpoint accepts manipulated input without adequate validation, but Elastic has not disclosed the offending field or processing operation. A low-privileged account and at least one configured Content Connector are required; successful requests interrupt availability without reported data access or modification.

The record

CVE
CVE-2026-26935
Published
Feb 26, 2026
Updated
Feb 26, 2026
Vendor
Elastic
Product
Kibana
Classifications
CWE-20, CAPEC-153, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.4.0 <=8.19.11
  2. Affected versionversion=9.0.0 <=9.2.5
  3. Affected versionversion=9.3.0 <=9.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Elastic · Kibanaversion=8.4.0 <=8.19.11; version=9.0.0 <=9.2.5; version=9.3.0 <=9.3.0

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5ElasticCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CAPEC-153Input Data Manipulation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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