CVE-2026-103401

Session Smart Router and Session Smart Conductor: An attacker can overwrite arbitrary files as root

Published Oct 28, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

Vendor Solution

The following software releases of Session Smart Router and Session Smart Conductor have been updated to resolve these specific issues: * 7.0.5 and all subsequent releases; * 7.1.7 and all subsequent releases; * 7.2.3 and all subsequent releases.


Vendor Workaround

There are no known workarounds for this issue.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Juniper
Juniper session Smart Conductor
Juniper session Smart Router
Vendors & Products Juniper
Juniper session Smart Conductor
Juniper session Smart Router
Type Values Removed Values Added
Description 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.
Title Session Smart Router and Session Smart Conductor: An attacker can overwrite arbitrary files as root
Weaknesses CWE-59
References
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
juniper
Published
Updated
Nov 6, 2026, 6:31 PM
Reserved
Sep 30, 2026, 2:33 PM
Status
Awaiting Analysis
Published
Oct 28, 2026, 5:17 PM
Modified
Nov 6, 2026, 7:17 PM