What is CVE-2026-103405?

CVE-2026-103405 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: 5.8/10. Published 2026-10-28.

How severe is CVE-2026-103405?

Medium severity. CVSS v3 base score is 5.8 out of 10.

Vulnerability in Juniper Networks Session Smart Conductor

CVE-2026-103405

An Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the web server in Juniper Networks Session Smart Router and Session Smart Conductor allows an attacker to inject arbitrary HTTP headers via unsanitized request body parameters.

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

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.

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-2026-103405?: CVE-2026-103405 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: 5.8/10. Published 2026-10-28.
How severe is CVE-2026-103405?: Medium severity. CVSS v3 base score is 5.8 out of 10.