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CVE-2026-78609— Incorrect Authorization in Elastic Cloud on Kubernetes Leading to Unauthorized Modification of Data

Quick assessment

Affected
Elastic Eck Operator
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Elastic Cloud on Kubernetes (ECK) 中的授权不正确（CWE-863）可能导致通过元数据篡改（CAPEC-690）发生未授权的数据修改。一个仅在单一命名空间内拥有有限 Kubernetes 权限的主体，能够使攻击者控制的证书材料被纳入 ECK 在另一个命名空间中管理的 Elasticsearch 客户端信任证书包中。

CVSS 5.4 · Medium
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I. Basic Information for CVE-2026-78609

Vulnerability Information
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Vulnerability Title
Incorrect Authorization in Elastic Cloud on Kubernetes Leading to Unauthorized Modification of Data
Source: CVE Program / CVE List V5
Vulnerability Description
Incorrect Authorization (CWE-863) in Elastic Cloud on Kubernetes (ECK) can lead to unauthorized modification of data via Metadata Spoofing (CAPEC-690). An actor holding limited Kubernetes permissions confined to a single namespace could cause attacker-controlled certificate material to be included in the Elasticsearch client trust bundle managed by ECK in a separate namespace.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Elastic Eck Operator 2.6.0 ~ 3.4.1 -

II. Public POCs for CVE-2026-78609

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III. Intelligence Information for CVE-2026-78609

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Vendor Advisories for CVE-2026-78609 (1)

Same Patch Batch · Elastic · 2026-09-02 · 15 CVEs total

CVE-2026-78604 7.8 HIGH Incorrect Permission Assignment for Critical Resource in Elastic Agent Leading to Local Pr
CVE-2026-78590 7.3 HIGH Improper Limitation of a Pathname to a Restricted Directory in Kibana Leading to Unauthori
CVE-2026-78588 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Filebeat Leading to Denial of Serv
CVE-2026-78586 6.5 MEDIUM Allocation of Resources Without Limits or Throttling in Kibana Leading to Denial of Servic
CVE-2026-78599 6.5 MEDIUM Stored Path Traversal in Kibana Leading to Unauthorized Deletion of Internal Resources
CVE-2026-78591 6.3 MEDIUM Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in Kibana L
CVE-2026-78601 5.5 MEDIUM Missing Authorization in Kibana Leading to Unauthorized Elasticsearch Index Data Exposure
CVE-2026-78598 5.4 MEDIUM Incorrect Authorization in Kibana Leading to Unauthorized Cross-Space Exposure of Machine
CVE-2026-78602 5.3 MEDIUM Improper Limitation of a Pathname to a Restricted Directory in Elastic Maps Server Leading
CVE-2026-78594 4.9 MEDIUM Improper Handling of Highly Compressed Data in APM Server Leading to Persistent Denial of
CVE-2026-82293 4.3 MEDIUM Incorrect Authorization in Kibana Leading to Unauthorized Resource Consumption
CVE-2026-78584 4.3 MEDIUM Observable Response Discrepancy in Kibana Leading to Cross-Space Information Disclosure
CVE-2026-78600 3.5 LOW Incomplete Cleanup in Elastic Cloud on Kubernetes Leading to Unauthorized Cross-Namespace
CVE-2026-78587 3.1 LOW Incorrect Authorization in Fleet Server Leading to Denial of Service of Agent Upload Opera

IV. Related Vulnerabilities

Same product: Eck Operator
Same vendor: Elastic
Same weakness: CWE-863

V. Comments for CVE-2026-78609

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