Critical [CVE-2026-103409] 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
This critical-severity Juniper Networks advisory covers CVE-2026-103409 affecting Session Smart Router.
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Summary
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.
- Session Smart Router before 7.0.5
- Session Smart Router 7.1.0 before 7.1.7
- Session Smart Router 7.2.0 before 7.2.3
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
- 7.0.5
- 7.1.7
- 7.2.3
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation
Upgrade to a fixed release: 7.0.5, 7.1.7, 7.2.3. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
More Juniper Networks advisories
- CVE-2026-106079Oct 28, 2026Session Smart Router command injection
- CVE-2026-103411Oct 28, 2026Integer Underflow vulnerability in DhcpMessageDecoder in Juniper Networks Session Smart
- CVE-2026-103410Oct 28, 2026Integer Overflow vulnerability in the DPI certificate scanner in Juniper Networks Session
- CVE-2026-103408Oct 28, 2026Stack Buffer Overflow vulnerability in the DHCP client in Juniper Networks Session Smart
- CVE-2026-103407Oct 28, 2026Session Smart Router path traversal
- CVE-2026-103405Oct 28, 2026Improper Neutralization of Special Elements in Output Used by a Downstream Component
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