What is CVE-2026-103401?

CVE-2026-103401 is a high-severity vulnerability in Juniper Networks Session Smart Conductor, classified under Improper Link Resolution Before File Access. CVSS score: 8.8/10. Published 2026-10-28.

How severe is CVE-2026-103401?

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

Vulnerability in Juniper Networks Session Smart Conductor

CVE-2026-103401

An Improper Link Resolution Before File Access ('Link Following') vulnerability in the unauthenticated web server handlers in Juniper Networks Session Smart Router and Session Smart Conductor allows a local unprivileged user to overwrite arbitrary files as root via unauthenticated API endpoints. This vulnerability can be exploited on Mist-managed routers and on unmanaged Routers that have not yet been onboarded to a Conductor. Routers already managed by Conductor are not affected.

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-59 — Improper Link Resolution Before File Access

References

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

Frequently asked questions

What is CVE-2026-103401?: CVE-2026-103401 is a high-severity vulnerability in Juniper Networks Session Smart Conductor, classified under Improper Link Resolution Before File Access. CVSS score: 8.8/10. Published 2026-10-28.
How severe is CVE-2026-103401?: High severity. CVSS v3 base score is 8.8 out of 10.