CVE-2026-78587 — LOW (3.1) — White Hats Nepal

Q: How severe is CVE-2026-78587?

CVE-2026-78587 has been rated LOW with a CVSS base score of 3.1/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-78587?

Check the references section above for vendor advisories and patch information. Affected products include: Elastic Fleet Server.

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.

CVSS Score

3.1

LOW

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 Products

Vendor	Product	Versions
Elastic	Fleet Server	>= 8.0.0, < 8.19.16

Related Weaknesses (CWE)

CWE-863

References

https://discuss.elastic.co/t/fleet-server-8-19-16-9-3-5-9-4-2-security-update-esVendor Advisory

FAQ

What is CVE-2026-78587?

CVE-2026-78587 is a vulnerability with a CVSS score of 3.1 (LOW). 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 d...

How severe is CVE-2026-78587?

CVE-2026-78587 has been rated LOW with a CVSS base score of 3.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-78587?

Check the references section above for vendor advisories and patch information. Affected products include: Elastic Fleet Server.