CVE-2026-24916: Huawei HarmonyOS Auth Bypass Vulnerability

CVE-2026-24916 Overview

CVE-2026-24916 is an identity authentication bypass vulnerability affecting the window module in Huawei HarmonyOS. This security flaw allows local attackers with low privileges to bypass authentication mechanisms, potentially leading to unauthorized access to sensitive information. The vulnerability impacts service confidentiality by enabling attackers to circumvent identity verification controls within the affected window module component.

Critical Impact

Successful exploitation of this vulnerability may allow attackers to bypass authentication controls and access confidential service data on affected HarmonyOS devices.

Affected Products

• Huawei HarmonyOS 6.0.0

Discovery Timeline

• February 6, 2026 - CVE-2026-24916 published to NVD
• February 10, 2026 - Last updated in NVD database

Technical Details for CVE-2026-24916

Vulnerability Analysis

This authentication bypass vulnerability exists within the window module of HarmonyOS, a key component responsible for managing window operations and user interface interactions on Huawei devices. The flaw falls under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), indicating that the vulnerability enables unauthorized disclosure of confidential information.

The vulnerability requires local access to exploit, meaning an attacker must already have some level of access to the target device. While the attacker needs low-level privileges to initiate the attack, no user interaction is required for successful exploitation. The impact is limited to confidentiality—the vulnerability does not allow modification of data or disruption of service availability.

Root Cause

The root cause of CVE-2026-24916 stems from improper identity authentication handling within the window module. The authentication bypass occurs when the module fails to properly validate user identity before granting access to protected resources. This weakness allows authenticated users with limited privileges to access sensitive information that should be restricted to higher-privilege contexts.

Attack Vector

The attack vector for this vulnerability is local, requiring the attacker to have existing access to the device. An attacker with low-privilege access to a HarmonyOS device can exploit this vulnerability by interacting with the window module in a manner that bypasses the intended authentication checks. The exploitation does not require any user interaction, and once exploited, the attacker can gain unauthorized access to confidential service data.

The attack scenario typically involves:

1. Gaining initial low-privilege access to a HarmonyOS 6.0.0 device
2. Interacting with the window module through crafted requests or API calls
3. Bypassing the identity authentication mechanism
4. Accessing sensitive information that should be protected by authentication controls

Detection Methods for CVE-2026-24916

Indicators of Compromise

• Unexpected authentication events or failed authentication attempts followed by successful access in window module logs
• Unusual process behavior involving the window module service accessing sensitive data paths
• Anomalous privilege usage patterns where low-privilege processes access protected resources

Detection Strategies

• Monitor system logs for authentication bypass attempts targeting the window module
• Implement behavioral analysis to detect unusual access patterns from low-privilege applications
• Deploy endpoint detection solutions capable of identifying exploitation attempts against HarmonyOS components

Monitoring Recommendations

• Enable verbose logging for the window module and related authentication services
• Configure alerts for any unexpected access to confidential service data
• Review device access logs regularly for signs of local privilege abuse

How to Mitigate CVE-2026-24916

Immediate Actions Required

• Update HarmonyOS devices to the latest patched version as provided by Huawei
• Review and restrict local access to HarmonyOS devices to trusted users only
• Implement additional access controls and monitoring on affected devices until patches can be applied

Patch Information

Huawei has addressed this vulnerability in their February 2026 security bulletin. Users and administrators should apply the latest security updates provided by Huawei to remediate this vulnerability. Detailed patch information and update instructions are available in the Huawei Security Bulletin.

Workarounds

• Limit physical and local access to HarmonyOS devices running version 6.0.0
• Implement strict user access policies to reduce the attack surface
• Enable device encryption and additional authentication layers where available
• Monitor for suspicious activity while awaiting official patch deployment

# Check HarmonyOS version and update status
# Navigate to Settings > About device > Software version
# Verify the security patch level is February 2026 or later