# CVE-2026-103402: Juniper Session Smart Router/Conductor cache injection privilege escalation

Source: https://junglewise.ai/threats/cve-2026-103402-an-insufficient-verification-of-data-authenticity-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-28. Updated: 2026-10-28  
License: CC BY 4.0 with a link back

CVE-2026-103402 · Severity: high · CVSS 8.8 · Published 2026-10-28

Juniper Networks Session Smart Router and Conductor are network management appliances that control data flow and routing. An attacker with write access to the model cache directory can inject malicious cache files and execute arbitrary code with elevated privileges. This allows complete compromise of the appliance and potentially the entire network it manages.

Technologies: [Juniper Networks Session Smart Conductor](https://junglewise.ai/threats/technologies/session-smart-conductor), [Juniper Networks Session Smart Router](https://junglewise.ai/threats/technologies/session-smart-router). Vendors: [Juniper Networks](https://junglewise.ai/threats/vendors/juniper-networks).

## Quick answers

**Is CVE-2026-103402 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-103402 being exploited in the wild.

**How severe is CVE-2026-103402?** High severity, with a CVSS score of 8.8, 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-2026-103402?** 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-2026-103402 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2026-103402?** 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 insufficient verification of data authenticity vulnerability exists in PCLI (Packet Control Language Interface) that fails to validate cache files before processing them. An attacker with local write access to the model cache directory can place crafted cache files that are executed with PCLI privileges. The vulnerability enables arbitrary code execution and privilege escalation.

## Affected products

- Juniper Networks Session Smart Router
- Juniper Networks Session Smart Conductor

## Timeline

- 2026-10-28: disclosed

## References

- [https://supportportal.juniper.net/JSA112183](https://supportportal.juniper.net/JSA112183)

## Related threats

- [Juniper Session Smart Router OS command injection in AccessManager](https://junglewise.ai/threats/cve-2026-106079-an-improper-neutralization-of-special-elements-used-in-an-os)
- [Juniper Networks Session Smart Router integer underflow in DHCP decoder](https://junglewise.ai/threats/cve-2026-103411-an-integer-underflow-vulnerability-in-dhcpmessagedecoder-in)
- [Juniper Networks Session Smart Router integer overflow in DPI certificate scanner](https://junglewise.ai/threats/cve-2026-103410-an-integer-overflow-vulnerability-in-the-dpi-certificate-scanner)
- [Juniper Networks Session Smart Router missing authentication](https://junglewise.ai/threats/cve-2026-103409-a-missing-authentication-for-critical-function-vulnerability-in)
- [Juniper Networks Session Smart Router stack buffer overflow in DHCP client](https://junglewise.ai/threats/cve-2026-103408-a-stack-buffer-overflow-vulnerability-in-the-dhcp-client-in)