CVE-2026-103007 Elastic CVE debrief

Who should care

Elasticsearch administrators and security teams should assess exposure and prioritize patching to prevent potential privilege escalation. They should also restrict delegated privileges, monitor cluster security, and review compensating controls to minimize risks. Affected operators and platform administrators should verify and apply patches, and review vulnerability management processes.

Why it matters

CVE-2026-103007 allows potential privilege escalation in Elasticsearch via incorrect authorization checks on delegated administrative privileges. Defenders should verify and apply patches, restrict delegated privileges, and monitor cluster security to minimize risks.

• Potential privilege escalation to full administrative control of the cluster
• Unauthorized access to restricted indices, including internal security data
• Possible exploitation by users with delegated privileges and broadly-scoped index patterns
• Verification of patched versions and restricted privileges required to minimize risks

Technical summary

Elasticsearch contains an incorrect authorization weakness in a configurable, non-default privilege that lets an administrator delegate limited role-management capability to another user, scoped to specific indices. The authorization check that enforces this scoping does not correctly account for a role-definition setting that can expand the matched index set. This weakness can allow potential privilege escalation in Elasticsearch via incorrect authorization checks on delegated administrative privileges. A user holding this delegated privilege with a broadly-scoped index pattern can exploit this inconsistency by updating their own assigned role to gain access to indices that should remain restricted, including

Defensive priority

Defenders should prioritize verifying and applying patches for Elasticsearch versions 8.16.0 through 8.19.21, 9.0.0 through 9.4.6, and 9.5.0 through 9.5.3, and restrict delegated administrative privileges to minimize potential escalation risks.

Recommended defensive actions

• Verify and apply patches for Elasticsearch versions 8.16.0 through 8.19.21, 9.0.0 through 9.4.6, and 9.5.0 through 9.5.3
• Restrict delegated administrative privileges to minimize potential escalation risks
• Monitor Elasticsearch cluster security and user activity for suspicious role updates or index access attempts
• 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 Program record and NIST NVD detail page provide official vulnerability metadata and assessment. Elasticsearch's security update ESA-2026-197 discusses the issue and provides patches. Defenders should verify patches for Elasticsearch versions 8.16.0 through 8.19.21, 9.0.0 through 9.4.6, and 9.5.0 through 9.5.3. Evidence is limited to public sources and CVE details.

Sources and 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.