Quick answers
- Is CVE-2026-103405 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-103405 being exploited in the wild.
- How severe is CVE-2026-103405?
- Medium severity, with a CVSS score of 5.8, 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-2026-103405?
- 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-2026-103405 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-103405?
- 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 elements vulnerability in the web server component fails to sanitize request body parameters before using them in downstream HTTP headers. An attacker can inject arbitrary headers via unsanitized input, requiring only network access to the web server with no prior authentication or user interaction needed.
Affected products
- Juniper Networks Session Smart Router
- Juniper Networks Session Smart Conductor
Timeline
- 2026-10-28: disclosed