Skip to content
Back to search

CVE-2026-103409

CRITICAL
9.8NVD

Summary

generated automatically from NVD data

Juniper Networks Session Smart Router contains a missing authentication flaw (CWE-306) on a critical function. An unauthenticated attacker on the network can send crafted URL parameters to an insecure endpoint running as root and gain administrative privileges. Exploitation is only possible before the device is onboarded to Mist/Conductor, and the issue can no longer be exploited afterward. The flaw is rated CRITICAL with a CVSS v3.1 score of 9.8.

NVD 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.

Share:

EPSS · FIRST.org

0.35%probability of exploitation in the next 30 days

Higher than 28% of scored CVEs

EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-29, recomputed daily by FIRST.org.

In-depth analysis on cveo.tech

This CVE is covered in an article: context, affected versions and published fixes.

CVSS v3.1 Score

9.8
/ 10.0
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Information

Published
28 oct. 2026
Updated
28 oct. 2026
Status
Awaiting Analysis
Source
sirt@juniper.net

Weaknesses (CWE)

CWE-306

Similar CVEs

Other vulnerabilities of type CWE-306

…

Know which CVEs hit the versions you run.

Add the product and its version: cveo.tech lists the CVEs that affect it right away, then alerts you by email when a new one affects it — including before NVD has finished its analysis. Free, an account is all it takes.