What’s Vulnerable › Vulnerabilities
CVE-2026-103401: Session Smart Router and Session Smart Conductor: An attacker can overwrite arbitrary files as root
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-28 · updated 2026-10-28
- Weakness: CWE-59
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.
Affected products
- Juniper Networks Session Smart Conductor: before 7.0.5; from 7.1.0 before 7.1.7; from 7.2.0 before 7.2.3 — fixed in 7.0.5, 7.1.7, 7.2.3
- Juniper Networks Session Smart Router: before 7.0.5; from 7.1.0 before 7.1.7; from 7.2.0 before 7.2.3 — fixed in 7.0.5, 7.1.7, 7.2.3
How to fix
Upgrade to a fixed version: Juniper Networks Session Smart Conductor 7.0.5, 7.1.7, 7.2.3; Juniper Networks Session Smart Router 7.0.5, 7.1.7, 7.2.3. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-103401 or the next vulnerability affects your stack