What is CVE-2026-103400?

CVE-2026-103400 is a medium-severity vulnerability in Juniper Networks Session Smart Conductor, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 5.5/10. Published 2026-10-28.

How severe is CVE-2026-103400?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Juniper Networks Session Smart Conductor

CVE-2026-103400

An Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the ember service in Juniper Networks Session Smart Router and Session Smart Conductor allows an attacker with local access to unmount arbitrary filesystems or cause a denial of service via the creation of specially named directories and a service restart.

Published 2026-10-28 · last modified 2026-10-29.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

supportportal.juniper.net/JSA112183 (vendor-advisory)

Frequently asked questions

What is CVE-2026-103400?: CVE-2026-103400 is a medium-severity vulnerability in Juniper Networks Session Smart Conductor, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 5.5/10. Published 2026-10-28.
How severe is CVE-2026-103400?: Medium severity. CVSS v3 base score is 5.5 out of 10.