# CVE-2026-18900: H3C NX15 OS command injection in Backend RPC

Source: https://junglewise.ai/threats/cve-2026-18900-h3c-nx15-os-command-injection-in-backend-rpc  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-05. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-18900 · Severity: high · CVSS 7.2 · Published 2026-08-05

H3C NX15 is a network management and control system used in enterprise environments. An OS command injection vulnerability in the Backend RPC component allows attackers to execute arbitrary operating system commands on the device. If exploited, an attacker could gain complete control of the system and compromise network infrastructure.

Technologies: [H3C NX15](https://junglewise.ai/threats/technologies/nx15). Vendors: [H3C](https://junglewise.ai/threats/vendors/h3c).

## Quick answers

**Is CVE-2026-18900 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-18900 being exploited in the wild.

**How severe is CVE-2026-18900?** High severity, with a CVSS score of 7.2, published 5 August 2026.

**Which products and versions are affected?** H3C NX15 V100R017.

**Is there a fix for CVE-2026-18900?** 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-2026-18900 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-18900?** Check whether you run H3C NX15 at an affected version. 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

The vulnerability is an OS command injection flaw in the file.exec function of the /api/esps endpoint in the Backend RPC component of H3C NX15 V100R017. The vulnerability exists due to insufficient input validation of the File parameter, which is passed unsanitized to operating system command execution. The attack is remotely accessible and exploitable after authentication. A successful exploit allows an attacker to execute arbitrary OS commands with the privileges of the affected service, potentially leading to complete system compromise. Public exploit code is available.

## Affected products

- H3C NX15 V100R017

## Timeline

- 2026-08-05: disclosed
- other: Public exploit code made available

## References

- [https://github.com/coconut652-7/IOT_Vul_Public/blob/main/H3C/NX15R017/file_exec_root_rce/poc/postauth_file_exec_rce.py](https://github.com/coconut652-7/IOT_Vul_Public/blob/main/H3C/NX15R017/file_exec_root_rce/poc/postauth_file_exec_rce.py)
- [https://github.com/coconut652-7/IOT_Vul_Public/blob/main/H3C/NX15R017/file_exec_root_rce/report/postauth_file_exec_rce_report.md](https://github.com/coconut652-7/IOT_Vul_Public/blob/main/H3C/NX15R017/file_exec_root_rce/report/postauth_file_exec_rce_report.md)

## Related threats

- [H3C NX15 command injection in WAN repeater configuration](https://junglewise.ai/threats/cve-2026-18902-h3c-nx15-command-injection-in-wan-repeater-configuration)
- [H3C NX15 dangerous routine exposure in Web API](https://junglewise.ai/threats/cve-2026-18901-h3c-nx15-dangerous-routine-exposure-in-web-api)
- [H3C NX15 command injection in reload.reload_config](https://junglewise.ai/threats/cve-2026-18814-h3c-nx15-command-injection-in-reload-reload-config)
- [H3C NX15 command injection in /api/esps delete](https://junglewise.ai/threats/cve-2026-18813-h3c-nx15-command-injection-in-api-esps-delete)
- [H3C NX15 command injection in esps.ipv6.wan](https://junglewise.ai/threats/cve-2026-18812-h3c-nx15-command-injection-in-esps-ipv6-wan)