CVE-2026-103409

critical · 9.8

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.

9.8

CVSS

0.3%

EPSS (exploit prob.)

28th

EPSS percentile

2026-10-28

Published

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

Weaknesses

CWE-306

References

https://supportportal.juniper.net/JSA112183

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-103409