CVE-2026-103409: Session Smart Router: An attacker obtains administrative privileges when an unauthenticated internal endpoint is accessed
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Juniper Networks Session Smart Routerto a version that resolves this vulnerability.Fixed in 7.0.5 - Upgrade
Upgrade
Juniper Networks Session Smart Routerto a version that resolves this vulnerability.Fixed in 7.1.7 - Upgrade
Upgrade
Juniper Networks Session Smart Routerto a version that resolves this vulnerability.Fixed in 7.2.3 - Compensating control
Onboard the Session Smart Router device to Mist/Conductor; the vulnerability can no longer be exploited once onboarding is complete.
Event History
Frequently Asked Questions
Which devices are exposed to exploitation?
Only Session Smart Router devices that have not yet been onboarded to Mist/Conductor are exploitable. The issue can no longer be exploited after onboarding to Mist/Conductor.
What does an attacker need to exploit this vulnerability?
An unauthenticated network-based attacker can exploit the issue by sending crafted URL parameters to an insecure endpoint that runs as root. No privileges or user interaction are required.
What can be done if patching is not immediately possible?
Onboard the device to Mist/Conductor, as the vulnerability can no longer be exploited once onboarding is complete.