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PatchSiren cyber security CVE debrief

CVE-2026-4498 Elastic CVE debrief

CVE-2026-4498 is a high-severity vulnerability in Elastic Kibana's Fleet plugin, allowing authenticated users with Fleet sub-feature privileges to read index data beyond their direct Elasticsearch RBAC scope. This issue arises from insufficient privilege checks in the Fleet plugin's debug route handlers, potentially leading to unauthorized data access. Users of Elastic Kibana, especially those with Fleet plugin privileges, should be aware of this vulnerability and take necessary actions to mitigate it.

Vendor
Elastic
Product
Kibana
CVSS
HIGH 7.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-08
Original CVE updated
2026-07-25
Advisory published
2026-04-08
Advisory updated
2026-07-25

Who should care

Users of Elastic Kibana, especially those with Fleet plugin privileges, should be aware of this vulnerability and take necessary actions to mitigate it. This includes administrators responsible for Kibana deployments, security teams monitoring for potential exploitation, and operators using Fleet plugin features.

Technical summary

The vulnerability is caused by insufficient privilege checks in the Fleet plugin's debug route handlers. An authenticated Kibana user with Fleet sub-feature privileges can exploit this issue to read index data beyond their direct Elasticsearch RBAC scope. This could lead to unauthorized access to sensitive data within the Kibana environment. The issue requires users to have Fleet sub-feature privileges such as agents, agent policies, and settings management. Evidence is limited to public sources and may not reflect the full scope of affected systems or potential impacts. Defenders should verify the vulnerability's relevance to their specific environments.

Defensive priority

High

Recommended defensive actions

  • Update Kibana to version 8.19.14, 9.2.8, or 9.3.3
  • Restrict Fleet plugin privileges to necessary users
  • Monitor for suspicious activity in Kibana logs
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-04-08T17:21:24.300Z and last modified on 2026-07-25T10:10:00.167Z. The NVD entry is currently Analyzed. Evidence is limited to public sources and may not reflect the full scope of affected systems or potential impacts. Defenders should verify the vulnerability's relevance to their specific environments.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-4498 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-4498

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-4498 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-4498

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.