How severe is CVE-2026-0543?

CVE-2026-0543 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-0543 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-0543?

CVE-2026-0543 affects Elastic Kibana. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-0543?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-0543 have an EU (EUVD) identifier?

Yes. CVE-2026-0543 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2035.

When was CVE-2026-0543 published?

CVE-2026-0543 was published on 2026-01-13 and last updated on 2026-06-17.

CVE-2026-0543

CVE-2026-0543 is a medium-severity vulnerability in Elastic Kibana with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-2035
Weakness: CWE-770
Affected product: Elastic Kibana
Published: 2026-01-13
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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 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.
How severe is CVE-2026-0543?: CVE-2026-0543 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-0543 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-0543?: CVE-2026-0543 affects Elastic Kibana. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-0543?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-0543 have an EU (EUVD) identifier?: Yes. CVE-2026-0543 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2035.
When was CVE-2026-0543 published?: CVE-2026-0543 was published on 2026-01-13 and last updated on 2026-06-17.

References

https://discuss.elastic.co/t/kibana-8-19-10-9-1-10-9-2-4-security-update-esa-2026-08/384523

Affected products (1)

cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*

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