What is CVE-2026-103403?

CVE-2026-103403 is a high-severity vulnerability in Juniper Networks Session Smart Conductor, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-10-28.

How severe is CVE-2026-103403?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Juniper Networks Session Smart Conductor

CVE-2026-103403

An Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in AccessManager in Juniper Networks Session Smart Router and Session Smart Conductor allows an attacker to perform arbitrary file deletion and arbitrary command execution via the deletion of an audit rule.

Vulnerability class: Command Injection (OS Command Injection)

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

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-78 — OS Command Injection

References

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

Frequently asked questions

What is CVE-2026-103403?: CVE-2026-103403 is a high-severity vulnerability in Juniper Networks Session Smart Conductor, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-10-28.
How severe is CVE-2026-103403?: High severity. CVSS v3 base score is 8.8 out of 10.