CVE-2026-103401 Session Smart Router and Session Smart Conductor: An attacker can overwrite arbitrary files as root
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-103401?
CVE-2026-103401 is a high-severity vulnerability in Juniper Networks Session Smart Conductor, published on 28 Oct 2026.
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.
Weakness: CWE-59
Which versions are affected by CVE-2026-103401?
How do I fix CVE-2026-103401?
No fix has been published for CVE-2026-103401 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-103401 being exploited?
There is no known exploitation of CVE-2026-103401 in the wild and no public exploit code.
Sources
Also known as GHSA-mw3r-9657-3g58.