Quick answers
- Is CVE-2026-103400 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-103400 being exploited in the wild.
- How severe is CVE-2026-103400?
- Medium severity, with a CVSS score of 5.5, published 28 October 2026.
- Which products and versions are affected?
- Juniper Networks Session Smart Router; Juniper Networks Session Smart Conductor.
- Is there a fix for CVE-2026-103400?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-103400 attacked?
- It is attacked with local access, in a network appliance.
- Am I affected by CVE-2026-103400?
- Check whether you run Juniper Networks Session Smart Conductor or Juniper Networks Session Smart Router. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
An improper neutralization of special characters in output (CWE-94 style injection) exists in the ember service of Session Smart Router and Conductor. The vulnerability requires local access and service restart as preconditions. An attacker can craft directory names that exploit insufficient input validation during service initialization, allowing arbitrary filesystem operations including unmount commands or service manipulation.
Affected products
- Juniper Networks Session Smart Router
- Juniper Networks Session Smart Conductor
Timeline
- 2026-10-28: disclosed