How severe is CVE-2026-26939?

CVE-2026-26939 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 high, and availability none.

Is CVE-2026-26939 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-26939?

CVE-2026-26939 primarily affects Elastic Kibana. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-26939?

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

Does CVE-2026-26939 have an EU (EUVD) identifier?

Yes. CVE-2026-26939 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13143.

When was CVE-2026-26939 published?

CVE-2026-26939 was published on 2026-03-19 and last updated on 2026-06-17.

CVE-2026-26939

CVE-2026-26939 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-862.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-13143
Weakness: CWE-862
Affected product: Elastic Kibana
Published: 2026-03-19
Last modified: 2026-06-17

Description

Missing Authorization (CWE-862) in Kibana’s server-side Detection Rule Management can lead to Unauthorized Endpoint Response Action Configuration (host isolation, process termination, and process suspension) via CAPEC-1 (Accessing Functionality Not Properly Constrained by ACLs). This requires an authenticated attacker with rule management privileges.

Frequently asked questions

What is CVE-2026-26939?: Missing Authorization (CWE-862) in Kibana’s server-side Detection Rule Management can lead to Unauthorized Endpoint Response Action Configuration (host isolation, process termination, and process suspension) via CAPEC-1 (Accessing Functionality Not Properly Constrained by ACLs). This requires an authenticated attacker with rule management privileges.
How severe is CVE-2026-26939?: CVE-2026-26939 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 high, and availability none.
Is CVE-2026-26939 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-26939?: CVE-2026-26939 primarily affects Elastic Kibana. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-26939?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-26939 have an EU (EUVD) identifier?: Yes. CVE-2026-26939 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13143.
When was CVE-2026-26939 published?: CVE-2026-26939 was published on 2026-03-19 and last updated on 2026-06-17.

References

https://discuss.elastic.co/t/kibana-8-19-12-9-2-6-9-3-1-security-update-esa-2026-19/385530

Affected products (2)

cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*
cpe:2.3:a:elastic:kibana:9.3.0:*:*:*:*:*:*:*

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