CVE-2026-23810: Wi-Fi Authentication Bypass Vulnerability

CVE-2026-23810 Overview

A vulnerability in the packet processing logic of Wi-Fi Access Points may allow an authenticated attacker to craft and transmit a malicious Wi-Fi frame that causes an Access Point (AP) to classify the frame as group-addressed traffic and re-encrypt it using the Group Temporal Key (GTK) associated with the victim's BSSID. This network protocol vulnerability enables GTK-independent traffic injection and, when combined with a port-stealing technique, allows an attacker to redirect intercepted traffic to facilitate machine-in-the-middle (MitM) attacks across BSSID boundaries.

Critical Impact

Successful exploitation enables traffic interception and machine-in-the-middle attacks on wireless networks, potentially compromising the confidentiality of network communications between authenticated clients and the access point.

Affected Products

• Wi-Fi Access Points with vulnerable packet processing logic
• Network infrastructure devices implementing affected frame classification mechanisms
• Wireless network equipment susceptible to GTK-based traffic injection

Discovery Timeline

• 2026-03-04 - CVE CVE-2026-23810 published to NVD
• 2026-03-04 - Last updated in NVD database

Technical Details for CVE-2026-23810

Vulnerability Analysis

This vulnerability (CWE-300: Channel Accessible by Non-Endpoint) represents a fundamental flaw in how Wi-Fi Access Points process and classify incoming frames. The vulnerability exists in the packet processing logic that determines whether a frame should be treated as unicast or group-addressed traffic.

When an authenticated attacker crafts a specially formed Wi-Fi frame, the Access Point incorrectly classifies it as group-addressed traffic. This misclassification triggers the AP to re-encrypt the frame using the Group Temporal Key (GTK) rather than the appropriate pairwise key. The GTK is a shared encryption key known to all authenticated clients within the network, which fundamentally undermines the isolation that should exist between wireless clients.

The attack requires the attacker to be within adjacent network range (the same wireless network segment) and does not require any user interaction. The exploitation can be enhanced through a port-stealing technique that enables traffic redirection, ultimately facilitating comprehensive machine-in-the-middle attacks that can cross BSSID boundaries within the wireless infrastructure.

Root Cause

The root cause lies in improper frame classification logic within the Access Point's packet processing mechanism. The vulnerability stems from insufficient validation of frame addressing fields, allowing an attacker to manipulate frames in a way that tricks the AP into applying group encryption (GTK) to traffic that should remain unicast. This represents a fundamental design flaw in how the affected devices distinguish between unicast and multicast/broadcast traffic at the MAC layer.

Attack Vector

The attack vector requires adjacent network access, meaning the attacker must be within wireless range of the target Access Point. The attacker must first authenticate to the wireless network, after which they can:

1. Craft malicious Wi-Fi frames with manipulated addressing fields
2. Transmit these frames to the Access Point
3. Cause the AP to misclassify and re-encrypt traffic using the GTK
4. Employ port-stealing techniques to redirect victim traffic
5. Intercept and potentially modify communications in a MitM position

The vulnerability mechanism exploits the frame classification process in Access Points. When a specially crafted frame is received, the AP's packet processing logic fails to properly validate the addressing fields, causing it to treat unicast traffic as group-addressed. This triggers re-encryption with the GTK shared among all authenticated clients. Technical details are available in the HPE Security Advisory.

Detection Methods for CVE-2026-23810

Indicators of Compromise

• Unusual patterns of group-addressed traffic originating from individual client MAC addresses
• Unexpected GTK re-encryption events logged by wireless infrastructure monitoring systems
• ARP cache anomalies or MAC address spoofing attempts on the wireless network
• Traffic patterns indicating port-stealing behavior between wireless clients

Detection Strategies

• Deploy wireless intrusion detection systems (WIDS) capable of monitoring frame classification anomalies
• Enable detailed logging on Access Points to capture frame processing events and encryption key usage
• Monitor for unexpected patterns in GTK usage that deviate from normal multicast/broadcast traffic
• Implement network traffic analysis to detect MitM attack signatures and traffic redirection attempts

Monitoring Recommendations

• Configure wireless controllers to alert on unusual frame classification patterns
• Establish baseline metrics for group-addressed traffic volume and monitor for deviations
• Deploy SentinelOne Singularity for endpoint visibility to detect potential MitM attack consequences on connected devices
• Implement continuous monitoring of ARP tables and MAC-to-IP bindings across the wireless infrastructure

How to Mitigate CVE-2026-23810

Immediate Actions Required

• Review the HPE Security Advisory for specific patch information and affected product details
• Audit wireless infrastructure to identify potentially affected Access Points
• Enable enhanced logging on wireless infrastructure pending patch deployment
• Implement network segmentation to limit the scope of potential MitM attacks

Patch Information

Consult the HPE Security Advisory for specific patch availability and firmware update instructions for affected devices. Apply vendor-provided security updates as soon as they become available to address the underlying packet processing vulnerability.

Workarounds

• Enable client isolation features on Access Points where available to limit client-to-client communication
• Implement 802.1X authentication with unique per-session keys to enhance traffic isolation
• Deploy additional network encryption layers (such as VPN or TLS) for sensitive communications
• Consider physical security controls to limit unauthorized wireless access within adjacent network range

# Example: Enable client isolation on wireless network (syntax varies by vendor)
# Consult vendor documentation for specific commands
# wireless client-isolation enable
# wireless enhanced-security-mode enable