Patchfirst
CVE-2026-103409 Critical · 9.8 EPSS 0.3%

A Missing authentication for critical function vulnerability in Juniper Networks Session Smart Router allows an…

Juniper Networks · Session Smart Router

Summary

A missing-authentication flaw in Juniper Networks' Session Smart Router product allows an attacker to reach a critical function without any credentials. The insecure endpoint runs as root, so an unauthenticated attacker on the network can gain administrative privileges by sending crafted URL parameters, but only before the device has been onboarded to Mist/Conductor.

Official description · NVD

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.

Breakdown
13.2 / 100
Exploited
Not confirmed
Reports
0
Tactics
0/15

Disclosed on 28 Oct 2026. No public exploit code or confirmed exploitation is recorded.

techniques

No techniques linked

No ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.

What security researchers reported

Not named in any threat report yet

Also mentioned in 1 community threat pulse (AlienVault OTX)

Weaker evidence

Pulses are indicator collections that anyone can publish. A mention is not confirmation of exploitation.

References

1 link, grouped by NVD tag
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