How severe is CVE-2026-78584?

CVE-2026-78584 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-78584 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-78584?

CVE-2026-78584 affects Elastic Kibana. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-78584?

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

When was CVE-2026-78584 published?

CVE-2026-78584 was published on 2026-09-02 and last updated on 2026-09-03.

CVE-2026-78584

CVE-2026-78584 is a medium-severity vulnerability in Elastic Kibana with a CVSS 3.x base score of 4.3. 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-204.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (22nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-204
Affected product: Elastic Kibana
Published: 2026-09-02
Last modified: 2026-09-03

Description

Observable Response Discrepancy (CWE-204) in the Kibana Osquery feature can lead to information disclosure via Query System for Information (CAPEC-54). An authenticated user holding Osquery live-query privileges could determine whether a scheduled query identifier exists in a Kibana space they are not authorized to access.

Frequently asked questions

What is CVE-2026-78584?: Observable Response Discrepancy (CWE-204) in the Kibana Osquery feature can lead to information disclosure via Query System for Information (CAPEC-54). An authenticated user holding Osquery live-query privileges could determine whether a scheduled query identifier exists in a Kibana space they are not authorized to access.
How severe is CVE-2026-78584?: CVE-2026-78584 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-78584 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (22nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-78584?: CVE-2026-78584 affects Elastic Kibana. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-78584?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-78584 published?: CVE-2026-78584 was published on 2026-09-02 and last updated on 2026-09-03.

References

https://discuss.elastic.co/t/kibana-9-4-4-security-update-esa-2026-161/390115

Affected products (1)

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

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