External risk intelligence

AOS-S Web Management Authentication Bypass

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-76742

The vulnerability affects the web management interface of AOS-S. While intended for administrative use, management interfaces are frequently exposed to the network, and when misconfigured or left accessible, they are commonly reachable via the internet in enterprise and network infrastructure deployments.

Authentication Bypass

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability in the AOS-S web management interface could allow unauthorized remote access without authentication. This means an attacker could potentially bypass security controls to gain control of the system, impacting its availability and integrity. The main concern is confirming relevance and exposure to our environment.

Bypass access controls for system management.
Critical flaw allows unauthenticated remote access.
Confirm relevance and assess system exposure.

Attack Path

How an attacker could exploit the issue

An attacker could reach the web management interface of AOS-S over the network without needing any credentials. By interacting with this interface, they could potentially bypass authentication, leading to unauthorized access and control over the system.

Unauthenticated remote access required.
Exploits the web management interface.
Leads to unauthorized system access.

Live Threat

Current exploitation, exposure, and threat context

Successful exploitation of this vulnerability could allow an unauthenticated remote attacker to bypass authentication and gain unauthorized access to the affected system's web management interface. This could lead to the disclosure of sensitive system information, modification of system configurations, or disruption of service, depending on the capabilities accessible through the interface.

System data and configuration at risk.
Unauthorized access via web interface.
Compromise of system integrity and availability.

Operational Fix

Recommended remediation, mitigation, and detection steps

The web management interface of AOS-S is vulnerable to authentication bypass, potentially allowing unauthenticated remote attackers unauthorized access. Responsibility for addressing this likely falls to infrastructure or network security teams, who should first identify all instances of AOS-S, assess their network exposure and criticality, and confirm the business-impacted owner to prioritize remediation.

Infrastructure or network security teams own.
Verify AOS-S instances and exposure.
Plan remediation based on criticality.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is AOS-S?

AOS-S is the operating system powering various HPE Aruba networking switches. It provides the core software capabilities that allow these switches to manage data traffic, configure network ports, and handle administrative tasks across enterprise and campus environments.

How does CVE-2026-76742 work?

This vulnerability is an authentication bypass. In software security, this means the mechanism intended to verify a user's identity is effectively ignored or circumvented. For this CVE, it allows someone to reach the management interface and gain full access without providing any valid username or password.

Do I need to be logged in to trigger this bug?

No. The flaw specifically allows unauthenticated access, meaning an attacker does not need an existing account or legitimate credentials to initiate the attack. Interactions that occur after successfully logging in normally do not trigger this vulnerability, as it targets the authentication process itself.

Why is this CVE dangerous for my network?

According to Halo Surface Signal, the danger stems from the nature of the web management interface. These interfaces are often reachable over the network. If your switch interface is accessible from the internet or an untrusted network segment, an attacker could remotely seize control of your network infrastructure.

How should I respond to this threat?

Start by identifying all AOS-S devices in your inventory to understand where they exist. Once mapped, check which of these have their web management interfaces reachable over the network. Prioritize restricting access to these interfaces to trusted management subnets until you can apply the necessary vendor updates.

References

support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw05156en_us&docLo…

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.