CVE-2026-103409 A Missing authentication for critical function vulnerability in Juniper Networks Session Smart Router allows an unauthenticated network-base
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-103409?
CVE-2026-103409 is a critical vulnerability in Juniper Networks Session Smart Router, published on 28 Oct 2026.
Official 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.
Weakness: CWE-306
Which versions are affected by CVE-2026-103409?
How do I fix CVE-2026-103409?
No fix has been published for CVE-2026-103409 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-103409 being exploited?
There is no known exploitation of CVE-2026-103409 in the wild and no public exploit code.
Sources
Also known as GHSA-4j2g-4264-38mr.