CVE-2026-76725: HPE Instant ON AP Auth Bypass Vulnerability

CVE-2026-76725 Overview

CVE-2026-76725 is an authentication bypass vulnerability in a management protocol used by HPE Networking Instant ON access points (APs). An unauthenticated attacker on an adjacent network can circumvent existing authentication controls. Successful exploitation results in a complete bypass of security restrictions and can lead to remote code execution with elevated privileges. The scope of impact extends beyond the vulnerable component, affecting resources managed by other security authorities on the same network.

Critical Impact
An unauthenticated adjacent attacker can bypass authentication on HPE Networking Instant ON APs and achieve remote code execution with elevated privileges, gaining full control of affected wireless infrastructure.

Affected Products

HPE Networking Instant ON Access Points (see HPE Security Advisory for specific models and firmware versions)

Discovery Timeline

2026-09-29 - CVE-2026-76725 published to the National Vulnerability Database (NVD)
2026-09-29 - Last updated in NVD database

Technical Details for CVE-2026-76725

Vulnerability Analysis

The flaw resides in a management protocol implementation on HPE Networking Instant ON APs. Authentication controls in that protocol can be circumvented by an attacker who reaches the management interface across an adjacent Layer 2 or wireless segment. No credentials, user interaction, or prior foothold are required.

Because the bypass occurs at the authentication layer, subsequent management operations run with the privileges of a trusted administrator. HPE describes the outcome as a complete bypass of security restrictions with the potential for remote code execution at elevated privilege. Compromise of an access point exposes SSID configuration, connected clients, and any management VLANs the device can reach.

Root Cause

HPE has not published a component-level breakdown. The advisory characterizes the issue as improper enforcement of authentication within a management protocol, which is consistent with an authentication bypass class weakness. The scope change reflected in the vulnerability metrics indicates that a compromised AP grants access to resources outside the AP's own security boundary.

Attack Vector

Exploitation requires network adjacency, meaning the attacker must be positioned on the same broadcast domain, a directly connected VLAN, or an associated wireless segment where the management protocol is reachable. This scenario is realistic in shared office space, guest networks that are inadequately segmented, and any environment where the AP management plane is not isolated from data traffic.

Once reachable, the attacker sends crafted management protocol requests that skip the authentication step. Because no valid credentials are required, exploitation can be automated and repeated across every reachable AP.

No public proof-of-concept, exploit code, or CISA KEV entry is associated with CVE-2026-76725 as of publication. Technical details are limited to the HPE Security Advisory.

Detection Methods for CVE-2026-76725

Indicators of Compromise

Unexpected administrative sessions or configuration changes on Instant ON APs originating from client-side VLANs or wireless segments
New or modified SSIDs, RADIUS server entries, or firmware images that were not deployed by the network team
Outbound connections from AP management interfaces to unfamiliar hosts, which may indicate post-exploitation command and control
Repeated management protocol requests from a single adjacent host targeting multiple APs in a short window

Detection Strategies

Baseline legitimate management traffic to the APs, then alert on management protocol requests sourced from non-management VLANs
Monitor Instant ON cloud portal audit logs for administrative actions that do not correlate with a known operator session
Compare running configuration and firmware hashes against a known-good baseline on a scheduled cadence

Monitoring Recommendations

Forward AP syslog, wireless controller logs, and switch port telemetry to a centralized analytics platform for correlation
Track authentication successes and failures on the AP management plane and alert on successful sessions without a preceding authentication event
Enable flow logging on the switch ports uplinking each AP to identify anomalous east-west traffic from the management interface

How to Mitigate CVE-2026-76725

Immediate Actions Required

Apply the firmware update referenced in the HPE Security Advisory to every Instant ON AP in the environment
Inventory all Instant ON deployments, including remote-worker and small-site installations, to ensure no device is missed
Restrict the AP management VLAN so that only authorized administrative hosts can reach the management protocol
Rotate any shared administrative credentials and API tokens used with the Instant ON cloud portal after patching

Patch Information

HPE has released fixed firmware for affected Instant ON AP models. Refer to the HPE Security Advisory for the specific fixed versions per product line and follow HPE's guidance for staged upgrade through the Instant ON cloud management console.

Workarounds

Segment AP management interfaces onto a dedicated VLAN that is inaccessible from client wireless SSIDs and untrusted wired ports
Apply access control lists on upstream switches to permit management protocol traffic only from designated administrator subnets
Disable guest or unauthenticated wireless networks bridged to segments where AP management is reachable until firmware is applied

bash

# Configuration example: restrict AP management VLAN at the upstream switch
# (syntax will vary by switch vendor)
access-list 150 permit ip 10.10.50.0 0.0.0.255 10.20.0.0 0.0.0.255
access-list 150 deny   ip any 10.20.0.0 0.0.0.255
access-list 150 permit ip any any
interface Vlan20
 description Instant-ON-Mgmt
 ip access-group 150 in