CVE-2026-78587Incorrect Authorization in Fleet Server Leading to Denial of Service of Agent Upload Operations
Updated under an hour ago ()
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It affects Elastic Fleet Server. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 3.1 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
- Weakness (CWE)
- CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- elastic
- NVD analysis
- Analyzed
- Record last updated
- Sep 2, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Elastic Fleet Server elastic:fleet_server (from the name) | from 8.0.0 through 8.19.15; from 9.0.0 through 9.3.4; from 9.4.0 through 9.4.1 | CNA record |
elastic fleet_server elastic:fleet_server | from 8.0.0 before 8.19.16; from 9.0.0 before 9.3.5; from 9.4.0 before 9.4.2 | NVD |
References
- https://discuss.elastic.co/t/fleet-server-8-19-16-9-3-5-9-4-2-security-update-esa-2026-164/390117vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.