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Fencer Vulns
medium 6.5

CVE-2026-0543 json

Improper Input Validation in Kibana Email Connector Leading to Excessive Allocation

published 2026-01-13 9 mo ago modified 2026-09-08 2 mo ago also BIT-elk-2026-0543 , BIT-kibana-2026-0543 , EUVD-2026-2035

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

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.

Patch / fix

  • bitnami elk 8.19.10, 9.1.10, 9.2.4
  • bitnami kibana 8.19.10, 9.1.10, 9.2.4
  • elastic kibana 8.19.10, 9.1.10, 9.2.4
  • elasticsearch kibana 8.19.10, 9.1.10, 9.2.4

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-0543 updated cvss 6.5

Kibana: Kibana: Denial of Service due to improper input validation in Email Connector

  • Red Hat Logging Subsystem for Red Hat OpenShift openshift-logging/kibana6-rhel8, openshift-logging/elasticsearch-rhel9-operator, openshift-logging/cluster-logging-rhel9-operator Red Hat JBoss Enterprise Application Platform 8 kibana Red Hat JBoss Enterprise Application Platform Expansion Pack kibana Red Hat OpenShift distributed tracing 3 rhosdt/tempo-jaeger-query-rhel8 Red Hat OpenStack Platform 16.2 puppet-kibana3
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami elk
<8.19.10
>=9.0.0, <9.1.10
>=9.2.0, <9.2.4
8.19.10
9.1.10
9.2.4
bitnami kibana
<8.19.10
>=9.0.0, <9.1.10
>=9.2.0, <9.2.4
8.19.10
9.1.10
9.2.4

Affected products

  • Elastic Kibana

Classification

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

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.