CVE-2026-78587
lowIncorrect Authorization (CWE-863) in Fleet Server can lead to a denial of service of agent upload operations via Privilege Abuse (CAPEC-122).
Vendor / product: Elastic — fleet server
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
3.1 (CVSS v3.1)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L Severity source: NVD CVSS v3.1 (security@elastic.co)
Timeline (UTC)
Published: 2026-09-02 15:17
Modified: 2026-09-03 19:11
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-10-27 06:50 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
elastic / fleet_server ≥8.0.0 <8.19.16, ≥9.0.0 <9.3.5, ≥9.4.0 <9.4.2
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:50 UTC · record ↗