Vulnerability in Juniper Networks Session Smart Router

[ Description ]Official description

An Improper Link Resolution Before File Access ('Link Following') vulnerability in the unauthenticated web server handlers in Juniper Networks Session Smart Router and Session Smart Conductor allows a local unprivileged user to overwrite arbitrary files as root via unauthenticated API endpoints. This vulnerability can be exploited on Mist-managed routers and on unmanaged Routers that have not yet been onboarded to a Conductor. Routers already managed by Conductor are not affected.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• NCSC-NL30 Oct 2026NCSC-2026-0462

  Vulnerabilities fixed in Juniper Networks Session Smart Router and Session Smart Conductor Translated from Dutch

  Probability/damage M/HCVE-2026-103390CVE-2026-103391CVE-2026-103392+15 more CVEs
• CERT-FR29 Oct 2026CERTFR-2026-AVI-1414

  Multiple vulnerabilities in Juniper Networks products Translated from French

  Multiple vulnerabilities have been discovered in Juniper Networks products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-103407CVE-2026-103409CVE-2026-103410+15 more CVEs
• BSI CERT-Bund28 Oct 2026WID-SEC-2026-4234

  Juniper Session Smart Router: Multiple vulnerabilities Translated from German

  CVE-2026-103408CVE-2026-103402CVE-2026-103401+15 more CVEs

[ References ]References

• supportportal.juniper.net/JSA112183