CVE-2026-73751: Web Management Interface RCE Vulnerability

CVE-2026-73751 Overview

CVE-2026-73751 is an authenticated command injection vulnerability affecting a Hewlett Packard Enterprise (HPE) product with a web-based management interface. An authenticated user with low-privileged access can submit crafted input to execute arbitrary operating system commands on the underlying host. The flaw is tracked under CWE-77 (Improper Neutralization of Special Elements used in a Command).

Successful exploitation grants the attacker the privileges of the process handling the web interface, which typically enables full compromise of the appliance and lateral movement into adjacent networks.

Critical Impact
A low-privileged authenticated attacker can achieve arbitrary command execution on the underlying operating system, leading to full device compromise.

Affected Products

Hewlett Packard Enterprise networking product (see HPE Security Bulletin for specific models and firmware versions)

Discovery Timeline

2026-09-01 - CVE-2026-73751 published to NVD
2026-09-03 - Last updated in NVD database

Technical Details for CVE-2026-73751

Vulnerability Analysis

The vulnerability resides in the web-based management interface of the affected HPE product. The interface passes user-supplied input into an operating system command context without adequate neutralization of shell metacharacters or command separators. An authenticated attacker with low privileges can inject additional commands that the underlying shell then executes.

Because the attack vector is network-based and the attacker only needs low-privileged credentials, any compromised or shared low-tier account becomes a viable entry point. Successful exploitation impacts confidentiality, integrity, and availability of the appliance.

Root Cause

The root cause is improper neutralization of special elements used in a command [CWE-77]. The management interface constructs command strings by concatenating user-controlled parameters into calls executed by an operating system shell. Metacharacters such as ;, |, &, backticks, and $() are not stripped or escaped, allowing an attacker to break out of the intended command and append arbitrary payloads.

Attack Vector

An attacker authenticates to the web management interface using any valid low-privileged account. The attacker then submits a crafted request to a vulnerable endpoint, embedding shell metacharacters within a parameter that is passed to an underlying system call. The injected commands run with the privileges of the web management process, which on most network appliances is a highly privileged service account or root.

No verified public proof-of-concept code is available at the time of publication. Refer to the HPE Security Bulletin for vendor-specific technical details.

Detection Methods for CVE-2026-73751

Indicators of Compromise

Unexpected child processes spawned by the web management service, such as sh, bash, wget, curl, nc, or python.
Outbound network connections initiated by the management interface process to unknown external hosts.
New or modified files in system directories following authenticated management sessions from low-privileged users.
Web server or management interface logs containing shell metacharacters (;, |, &&, backticks, $()) in request parameters.

Detection Strategies

Inspect web management access logs for suspicious parameter payloads containing shell metacharacters or command chaining syntax.
Correlate authenticated session activity from low-privileged accounts with process execution telemetry on the appliance host.
Alert on any process ancestry where the web management daemon spawns interactive shells or common living-off-the-land binaries.

Monitoring Recommendations

Enable verbose audit logging on the HPE management interface and forward logs to a centralized SIEM for retention and correlation.
Monitor authentication events for low-privileged accounts, particularly logins from unusual source addresses or outside business hours.
Track outbound network flows from management interfaces and alert on connections to non-approved destinations.

How to Mitigate CVE-2026-73751

Immediate Actions Required

Apply the vendor-supplied firmware update referenced in the HPE Security Bulletin as soon as testing permits.
Restrict access to the web management interface to a dedicated management VLAN or bastion host.
Audit and rotate credentials for all low-privileged accounts on affected appliances.
Review authentication and command execution logs for signs of prior exploitation.

Patch Information

HPE has published a security bulletin describing the affected products and the fixed firmware versions. Administrators should consult the HPE Security Bulletin to identify the specific patched release for each device model and follow the vendor's upgrade procedure.

Workarounds

Disable the web-based management interface where command-line or out-of-band management is available.
Enforce network-layer access control lists that limit management interface reachability to trusted administrator workstations.
Require multi-factor authentication for all administrative accounts to reduce the risk of low-privileged credential compromise.

bash

# Example: restrict management interface access with an ACL
# Replace <mgmt-subnet> and <interface> with your environment values
access-list MGMT_ACL permit tcp <mgmt-subnet> 0.0.0.255 any eq 443
access-list MGMT_ACL deny   tcp any any eq 443
interface <interface>
  ip access-group MGMT_ACL in