CVE-2026-103401
High
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.
SeverityHigh
CVSS8.8
Exploit probability—
ProductSession Smart Router
PublishedOct 28, 2026
First seenNov 6, 2026
Weakness typeCWE-59Improper link resolution
How to fix
Update
- Juniper Networks Session Smart Router7.0.5, 7.1.7, 7.2.3 or later
- Juniper Networks Session Smart Conductor7.0.5, 7.1.7, 7.2.3 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Juniper Networks Session Smart Router | v < 7.0.5, 7.1.0 ≤ v < 7.1.7, 7.2.0 ≤ v < 7.2.3 | 7.0.5, 7.1.7, 7.2.3 |
| Juniper Networks Session Smart Conductor | v < 7.0.5, 7.1.0 ≤ v < 7.1.7, 7.2.0 ≤ v < 7.2.3 | 7.0.5, 7.1.7, 7.2.3 |
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