CVE-2026-49313: App Lock Module Privilege Escalation Flaw

CVE-2026-49313 Overview

CVE-2026-49313 is a permission control vulnerability in the app lock module of Huawei devices. The flaw is categorized under [CWE-264] Permissions, Privileges, and Access Controls. Successful exploitation may affect service confidentiality by exposing information that the app lock module is designed to protect.

The issue requires local access and low privileges, with no user interaction needed. It does not affect integrity or availability, but a local attacker can read protected data guarded by the app lock feature.

Critical Impact
A local, low-privileged attacker can bypass app lock permission checks and access confidential information stored behind the app lock control.

Affected Products

Huawei mobile devices referenced in the September 2026 Huawei consumer security bulletin
Devices running affected versions of the app lock module
See the Huawei Security Bulletin for the authoritative product and version list

Discovery Timeline

2026-09-09 - CVE-2026-49313 published to NVD
2026-09-09 - Last updated in NVD database

Technical Details for CVE-2026-49313

Vulnerability Analysis

The app lock module enforces access restrictions on user-selected applications, requiring authentication before granting access. CVE-2026-49313 stems from missing or incomplete permission validation in this module, mapped to [CWE-264].

A local process running with low privileges can invoke code paths that should be gated by the app lock check. Because the permission control does not properly verify the caller or context, protected data can be read without satisfying the intended authentication step. The impact is limited to confidentiality; integrity and availability remain unaffected.

Root Cause

The root cause is improper enforcement of access controls in the app lock module. The component does not consistently validate whether a caller holds the necessary permissions before exposing protected resources. This is a classic access control weakness where the security check is either missing on a specific code path or evaluated against attacker-controllable inputs.

Attack Vector

Exploitation requires local access to the device with low privileges, such as an installed application running in the standard app sandbox. No user interaction is required. An attacker leverages a local interface exposed by the app lock module to request information that should remain gated behind app lock authentication. Vendor advisory details are limited; consult the Huawei Security Bulletin for component-level information.

No public proof-of-concept has been published, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2026-49313

Indicators of Compromise

Unexpected access to app-locked applications without a prior successful authentication event in device logs
Installed third-party applications making unusual inter-process calls to app lock service interfaces
Device logs showing app lock queries followed by data access without the corresponding unlock prompt

Detection Strategies

Review mobile device management (MDM) telemetry for devices running Huawei firmware versions listed as vulnerable in the September 2026 bulletin
Monitor for installation of untrusted applications on devices that store sensitive data behind app lock
Correlate authentication events with app launches to identify access patterns that bypass the expected unlock flow

Monitoring Recommendations

Track Huawei firmware versions across the mobile fleet and flag devices that have not received the September 2026 security update
Enable MDM-based application allowlisting to reduce the population of untrusted local code capable of triggering the flaw
Alert on newly sideloaded applications on managed Huawei devices that hold corporate data

How to Mitigate CVE-2026-49313

Immediate Actions Required

Apply the security update referenced in the Huawei Security Bulletin for September 2026 as soon as it is available for the affected device model
Inventory Huawei devices in the environment and identify those pending the patch
Restrict installation of untrusted applications on devices holding sensitive data protected by app lock

Patch Information

Huawei addresses this issue in the September 2026 consumer security bulletin. Refer to the Huawei Security Bulletin for the specific EMUI or HarmonyOS build numbers that contain the fix for each affected device model.

Workarounds

Avoid installing untrusted or sideloaded applications on affected devices until the patch is applied
Do not rely on the app lock feature alone to protect highly sensitive data on unpatched devices; use additional platform protections such as secure folders or enterprise containers
Enforce MDM policies that limit which applications can be installed on corporate Huawei devices

bash

# Configuration example
# Check the current build number on a Huawei device to compare against the
# fixed version listed in the September 2026 Huawei security bulletin
adb shell getprop ro.build.display.id
adb shell getprop ro.build.version.emui