How severe is CVE-2026-78599?

CVE-2026-78599 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-2026-78599 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-78599?

CVE-2026-78599 affects Elastic Kibana. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-78599?

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

When was CVE-2026-78599 published?

CVE-2026-78599 was published on 2026-09-02 and last updated on 2026-09-03.

CVE-2026-78599

CVE-2026-78599 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-22.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (39th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Elastic Kibana
Published: 2026-09-02
Last modified: 2026-09-03

Description

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (CWE-22) in the Kibana Fleet feature can lead to the unauthorized deletion of internal resources via Path Traversal (CAPEC-126). A low-privileged user holding Fleet write access could cause a subsequent administrative delete action to act on unintended internal resources. Exploitation requires an administrator to interact with the affected Fleet interface.

Frequently asked questions

What is CVE-2026-78599?: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') (CWE-22) in the Kibana Fleet feature can lead to the unauthorized deletion of internal resources via Path Traversal (CAPEC-126). A low-privileged user holding Fleet write access could cause a subsequent administrative delete action to act on unintended internal resources. Exploitation requires an administrator to interact with the affected Fleet interface.
How severe is CVE-2026-78599?: CVE-2026-78599 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-2026-78599 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-78599?: CVE-2026-78599 affects Elastic Kibana. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-78599?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-78599 published?: CVE-2026-78599 was published on 2026-09-02 and last updated on 2026-09-03.

References

https://discuss.elastic.co/t/kibana-8-19-18-9-4-3-security-update-esa-2026-157/390112

Affected products (1)

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

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