Vulnerability · Published Oct 28, 2026 · Assigned by juniper

CVE-2026-103409Session Smart Router: An attacker obtains administrative privileges when an unauthenticated internal endpoint is accessed

Critical 9.8

In plain English

A critical-severity missing authentication in Session Smart Router from Juniper Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.3%top 71.5% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
Juniper Networks	Session Smart Router	0 – before 7.0.57.1.0 – before 7.1.77.2.0 – before 7.2.3

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

https://supportportal.juniper.net/JSA112183 vendor-advisory