CVE-2026-21029: Samsung Android Privilege Escalation Flaw

CVE-2026-21029 Overview

CVE-2026-21029 is a local privilege escalation vulnerability in Samsung's Galaxy Editing Service on Android. The flaw stems from improper export of Android application components, allowing a local attacker with low privileges to execute privileged operations on affected devices. Samsung addressed the issue in the SMR Jun-2026 Release 1 security maintenance update. The vulnerability affects Samsung Android versions 14.0, 15.0, and 16.0 across multiple prior SMR releases. The issue is tracked under [NVD-CWE-Other] and carries a CVSS v4.0 score of 6.8.

Critical Impact
A local application without elevated privileges can invoke exported components in Galaxy Editing Service to perform actions normally restricted to higher-privileged callers, leading to integrity compromise on the device.

Affected Products

Samsung Android 14.0 (releases prior to SMR Jun-2026 Release 1)
Samsung Android 15.0 (releases prior to SMR Jun-2026 Release 1)
Samsung Android 16.0 (releases prior to SMR Jun-2026 Release 1)

Discovery Timeline

2026-06-05 - CVE-2026-21029 published to NVD
2026-06-06 - Last updated in NVD database
June 2026 - Samsung releases SMR Jun-2026 Release 1 security patch

Technical Details for CVE-2026-21029

Vulnerability Analysis

The vulnerability resides in Samsung's Galaxy Editing Service, a system-level application present on Samsung Android devices. The service declares one or more Android components (Activities, Services, Broadcast Receivers, or Content Providers) with improper export settings. Components that should be restricted to the system or signature-protected callers are reachable by third-party applications installed on the device.

A local application can bind to or invoke these exported components and trigger functionality that runs under the privileges of Galaxy Editing Service. Because the service operates with elevated rights, the attacker indirectly executes privileged operations without holding the corresponding permissions.

The CVSS v4.0 vector indicates a local attack surface with low attacker privileges, no user interaction, and high integrity impact. Confidentiality and availability are not affected.

Root Cause

The root cause is misconfiguration of the android:exported attribute or absent permission protection on inter-process communication (IPC) entry points within the Galaxy Editing Service manifest. Components intended for internal use are exposed to arbitrary callers without enforcing signature or signatureOrSystem permission checks. This class of issue is commonly referred to as an Intent Redirection or Improper Export of Android Application Components flaw.

Attack Vector

Exploitation requires a malicious or compromised application already installed on the target Samsung device. The attacker app crafts an Intent targeting the exposed component of Galaxy Editing Service and supplies parameters that drive the privileged operation. No user interaction is required once the malicious app is running. Remote exploitation is not possible because the attack vector is local IPC.

No public proof-of-concept code is available for CVE-2026-21029, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog. The EPSS probability is 0.013%.

Detection Methods for CVE-2026-21029

Indicators of Compromise

Third-party applications issuing Intent calls or bindService requests targeting Galaxy Editing Service package components.
Unexpected file modifications or content changes attributable to the Galaxy Editing Service process originating from non-system callers.
Installation of applications from outside the Galaxy Store or Google Play that request broad media or storage access shortly before privileged operations occur.

Detection Strategies

Inventory installed Samsung Android devices and compare the security patch level against SMR Jun-2026 Release 1 or later.
Use mobile threat defense (MTD) tooling to flag applications that interact with Samsung system service components via reflection or undocumented IPC.
Review enterprise mobility management (EMM) logs for sideloaded APKs or apps with elevated runtime permissions on managed Samsung fleets.

Monitoring Recommendations

Monitor Samsung Knox audit logs, where available, for anomalous IPC activity targeting com.samsung.android editing-related packages.
Track Samsung's monthly Security Maintenance Release (SMR) bulletins and correlate device firmware levels in asset inventories.
Alert on devices that remain below the June 2026 patch level after the rollout window expires.

How to Mitigate CVE-2026-21029

Immediate Actions Required

Apply the Samsung SMR Jun-2026 Release 1 update to all affected Samsung Android 14.0, 15.0, and 16.0 devices.
Enforce minimum patch level policies through EMM/MDM so that devices below SMR Jun-2026 Release 1 lose access to corporate resources.
Audit installed applications on managed devices and remove untrusted or sideloaded apps that could host exploitation logic.

Patch Information

Samsung released the fix as part of the June 2026 Security Maintenance Release. Details are available in the Samsung Mobile Security Update bulletin. The patch corrects the export configuration of the affected Galaxy Editing Service components and adds permission enforcement on the IPC entry points.

Workarounds

Restrict installation of third-party applications on managed Samsung devices using EMM policy until the patch is deployed.
Enable Google Play Protect and Samsung's app scanning features to block known malicious applications that could chain into this issue.
For high-risk users, disable or uninstall Galaxy Editing Service where the device's workflow permits, pending firmware update.

bash

# Verify a Samsung device has the June 2026 SMR or later applied
adb shell getprop ro.build.version.security_patch
# Expected: 2026-06-01 or later

# Confirm Galaxy Editing Service package version on the device
adb shell dumpsys package com.samsung.android.app.galaxyeditingservice | grep versionName