How severe is CVE-2026-63259?

CVE-2026-63259 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-2026-63259 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-63259?

CVE-2026-63259 affects Elastic Kibana. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-63259?

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

When was CVE-2026-63259 published?

CVE-2026-63259 was published on 2026-07-21 and last updated on 2026-08-03.

CVE-2026-63259

CVE-2026-63259 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-639.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-639
Affected product: Elastic Kibana
Published: 2026-07-21
Last modified: 2026-08-03

Description

Authorization Bypass Through User-Controlled Key (CWE-639) in Kibana can lead to information disclosure via user-supplied identifiers that reference scheduled query result data from Kibana Spaces the requester is not authorized to access.

Frequently asked questions

What is CVE-2026-63259?: Authorization Bypass Through User-Controlled Key (CWE-639) in Kibana can lead to information disclosure via user-supplied identifiers that reference scheduled query result data from Kibana Spaces the requester is not authorized to access.
How severe is CVE-2026-63259?: CVE-2026-63259 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-2026-63259 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-63259?: CVE-2026-63259 affects Elastic Kibana. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-63259?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-63259 published?: CVE-2026-63259 was published on 2026-07-21 and last updated on 2026-08-03.

References

https://discuss.elastic.co/t/kibana-9-4-4-security-update-esa-2026-70/388573

Affected products (1)

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

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