CVE-2026-103409 Juniper Networks Session Smart Router - Authentication Bypass

Juniper Networks Session Smart Router contains a missing authentication for critical function caused by insecure endpoint accessible via crafted URL parameters, letting unauthenticated network attackers obtain administrative privileges, exploit requires device not onboarded to Mist/Conductor.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
28 October 2026
Updated
29 October 2026
Weakness
CWE-306

Vendor fix

Update to a version where device onboarding to Mist/Conductor is enforced or latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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