---
title: "CVE-2026-103401: Juniper Networks Session Smart Router & Conductor - Improper Link Resolution Before File Access"
description: "Juniper Networks Session Smart Router and Session Smart Conductor contain an improper link resolution before file access vulnerability in unauthenticated web server handlers, letting local unprivileged users overwrite arbitrary files as root via unauthenticated API endpoints, exploit requires local access on affected routers."
url: https://panop.io/threat-heartbeat/CVE-2026-103401/
---

# CVE-2026-103401 Juniper Networks Session Smart Router & Conductor - Improper Link Resolution Before File Access

Juniper Networks Session Smart Router and Session Smart Conductor contain an improper link resolution before file access vulnerability in unauthenticated web server handlers, letting local unprivileged users overwrite arbitrary files as root via unauthenticated API endpoints, exploit requires local access on affected routers.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-103401)

## Details

Type

Improper Link Resolution Before File Access

Impact

File System Write, Privilege Escalation

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

28 October 2026

Updated

29 October 2026

Weakness

[CWE-59](https://cwe.mitre.org/data/definitions/59.html)

## Vendor fix

Update to the latest version that patches this vulnerability.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-103401](https://nvd.nist.gov/vuln/detail/CVE-2026-103401)
- [https://supportportal.juniper.net/JSA112183](https://supportportal.juniper.net/JSA112183)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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