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CVE-2026-103409

9.8, critical

Juniper Networks Session Smart Router Missing Authentication for Critical Function Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
n/a
Exploitation
No public evidence
Published
28 Oct 2026yesterday

Description

A Missing authentication for critical function vulnerability in Juniper Networks Session Smart Router allows an unauthenticated network-based attacker to obtain administrative privileges by passing crafted URL parameters to an insecure endpoint running as root. Note that this vulnerability can only be exploited prior to the device being onboarded to Mist/Conductor. The issue can no longer be exploited once a device is onboarded to Mist/Conductor.

Details

Vendor
Juniper Networks
Product
Session Smart Router
Weakness
CWE-306 (opens in a new tab)
Status
Awaiting analysis
Updated
28 Oct 2026
Assigner
sirt@juniper.net

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

References 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Juniper Networks CVEs

Every Juniper Networks CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-103406 Juniper Networks Session Smart Conductor OS Command Injection Vulnerability 9.8, critical
  • CVE-2026-103401 Juniper Networks Session Smart Router Link Following Vulnerability 8.8, high
  • CVE-2026-103402 An Insufficient Verification of Data Authenticity vulnerability in PCLI in Juniper Networks Session Smart Router and Session Smart… 8.8, high
  • CVE-2026-103403 Juniper Networks Session Smart Router OS Command Injection Vulnerability 8.8, high
  • CVE-2026-103407 Juniper Networks Session Smart Router Path Traversal Vulnerability 8.8, high
  • CVE-2026-103408 Juniper Networks Session Smart Router Stack-based Buffer Overflow Vulnerability 8.8, high
  • CVE-2026-103411 Juniper Networks Session Smart Router Integer Underflow Vulnerability 7.1, high
  • CVE-2026-106079 Juniper Networks Session Smart Router OS Command Injection Vulnerability 8.8, high

Beyond this page

Is CVE-2026-103409 in your network?

This page tells you how dangerous CVE-2026-103409 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 29 Oct 2026, not the live upstream state.