Critical Security Alert: HPE Aruba Private 5G Core Plagued by Dangerous Open Redirect Flaw

Hewlett-Packard Enterprise (HPE) has issued a critical security disclosure concerning a significant flaw within its Aruba Networking Private 5G Core On-Prem platform. This vulnerability, officially identified as CVE-2026-23818, presents a severe risk, enabling attackers to steal sensitive user credentials by exploiting an open redirect issue embedded within the system’s graphical user interface (GUI) login process.

Understanding the Open Redirect Threat (CVE-2026-23818)

The core of this exploit lies in an open redirect vulnerability that targets the login flow of the HPE Aruba Private 5G Core. Attackers can leverage this weakness by crafting a specially manipulated, malicious URL. This URL is designed to trick an authenticated user into clicking it, initiating a sophisticated credential theft sequence.

How Credential Theft Unfolds

The attack relies heavily on user deception and social engineering tactics:

1. Malicious Link Engagement: A targeted user clicks on the attacker-generated fraudulent link.
2. Redirect to Malicious Server: The vulnerability silently redirects the victim from the legitimate HPE Aruba Private 5G Core portal to an external server controlled by the attacker.
3. Phishing Page Presentation: This malicious server hosts a meticulously designed, fraudulent login page that perfectly mimics the authentic HPE Aruba portal.
4. Credential Capture: Believing they are logging into the real system, the victim enters their username and password, which are secretly recorded by the attacker.
5. Return to Legitimate Site: To avoid suspicion, the fake page then silently redirects the user back to the actual HPE Aruba login screen, making the entire incident appear seamless.

Grave Implications for Enterprise Operations

Private 5G networks are indispensable for modern enterprise operations, serving as the backbone for sensitive data transmission and connecting critical business devices. The compromise of such a network can have catastrophic consequences. If attackers successfully capture valid administrative credentials for the HPE Aruba Private 5G Core, they can:

• Bypass standard security controls.
• Gain unauthorized access to the network management console.
• Alter critical network configurations.
• Disrupt essential business services.
• Launch deeper, more pervasive attacks into the entire enterprise environment.

Immediate Remediation Steps for Network Administrators

Network administrators must prioritize immediate action to mitigate this severe threat:

HPE has provided comprehensive remediation details in their security bulletin HPESBNW05032. It is imperative to apply the available security patches to resolve the open redirect issue within the HPE Aruba Private 5G Core platform without delay.

Beyond patching, organizations should also:

• Staff Training: Train employees to recognize suspicious links and verify URLs meticulously before entering any sensitive information, especially passwords.
• Multi-Factor Authentication (MFA): Implement and enforce multi-factor authentication across all accounts. MFA adds a crucial layer of security, protecting accounts even if an attacker manages to capture a password.