CVE-2026-78587
Incorrect Authorization in Fleet Server Leading to Denial of Service of Agent Upload Operations
CVSS Score
3.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-863 |
| Vendor | elastic |
| Product | fleet server |
| Published | Sep 2, 2026 |
| Last Updated | Sep 2, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
Elastic / Fleet Server
8.0.0 ≤ 8.19.15 9.0.0 ≤ 9.3.4 9.4.0 ≤ 9.4.1