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CVE-2026-78587— Incorrect Authorization in Fleet Server Leading to Denial of Service of Agent Upload Operations

Quick assessment

Affected
Elastic Fleet Server
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.

Fleet Server 中的授权不正确（CWE-863）可能导致通过权限滥用（CAPEC-122）引发 Agent 上传操作的拒绝服务。Fleet Server 在多部分数据上传过程中未能正确验证会话归属，使得任何已认证的 Agent 都能干扰其他已注册 Agent 的活跃上传会话。

CVSS 3.1 · Low

Possible ATT&CK Techniques 2 AI

T1207.004 T1598.003 · Spearphishing Link
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I. Basic Information for CVE-2026-78587

Vulnerability Information
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Vulnerability Title
Incorrect Authorization in Fleet Server Leading to Denial of Service of Agent Upload Operations
Source: CVE Program / CVE List V5
Vulnerability Description
Incorrect Authorization (CWE-863) in Fleet Server can lead to a denial of service of agent upload operations via Privilege Abuse (CAPEC-122). Fleet Server does not correctly verify session ownership during multi-part data upload operations, allowing any authenticated agent to interfere with the active upload sessions belonging to other enrolled agents.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
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 Fleet Server 8.0.0 ~ 8.19.15 -

II. Public POCs for CVE-2026-78587

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III. Intelligence Information for CVE-2026-78587

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Other References for CVE-2026-78587 (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-2026-78609 5.4 MEDIUM Incorrect Authorization in Elastic Cloud on Kubernetes Leading to Unauthorized Modificatio
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

IV. Related Vulnerabilities

Same product: Fleet Server
Same vendor: Elastic
Same weakness: CWE-863

V. Comments for CVE-2026-78587

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