CVE-2026-21127: Samsung Account Information Disclosure Flaw

CVE-2026-21127 Overview

CVE-2026-21127 is an improper export of Android application components vulnerability affecting Samsung Account prior to version 15.7.01.1. The flaw allows local attackers on the device to access sensitive data belonging to the Samsung Account application. The weakness is categorized under CWE-926: Improper Export of Android Application Components. Samsung addressed the issue in its October 2026 Security Maintenance Release.

Critical Impact
A local attacker with the ability to run an unprivileged app on the device can read sensitive data exposed by improperly exported Samsung Account components.

Affected Products

Samsung Account for Android prior to version 15.7.01.1
Samsung mobile devices with Samsung Account preinstalled
Devices that have not applied the October 2026 Samsung Mobile security update

Discovery Timeline

2026-10-12 - CVE-2026-21127 published to the National Vulnerability Database (NVD)
2026-10-16 - Last updated in NVD database

Technical Details for CVE-2026-21127

Vulnerability Analysis

The vulnerability resides in Samsung Account for Android. One or more application components (such as activities, services, content providers, or broadcast receivers) are exported to other applications on the device without adequate access control. On Android, an exported component is reachable by any installed app through standard inter-process communication (IPC) mechanisms such as Intent dispatch or ContentResolver queries.

Because the exposed component handles sensitive account-related data, a co-located malicious application can invoke it and retrieve information that should remain confined to the Samsung Account process. Exploitation requires local access to the device but no user interaction and no elevated privileges.

Root Cause

The root cause is an Android manifest or runtime configuration in which components of Samsung Account are declared with android:exported="true" (or are implicitly exported through intent filters) without a matching signature-level permission or caller verification. This mapping to [CWE-926] indicates the component treats external IPC callers as trusted, allowing arbitrary apps to reach code paths that return sensitive data.

Attack Vector

An attacker installs or runs an unprivileged application on the same device as Samsung Account. The malicious app issues a crafted Intent, binds to the exported service, or queries the exported provider to interact with the vulnerable component. The component responds with data from the Samsung Account context, resulting in information disclosure. Confidentiality is impacted; integrity and availability are not affected based on the published CVSS vector.

No public proof-of-concept exploit has been released, and the issue is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Detection Methods for CVE-2026-21127

Indicators of Compromise

Installed Samsung Account package (com.osp.app.signin or related Samsung Account components) reporting a version lower than 15.7.01.1.
Unexpected third-party applications issuing Intent traffic or ContentResolver queries targeting Samsung Account components.
Logcat entries showing cross-package IPC calls into Samsung Account from non-Samsung package names.

Detection Strategies

Inventory mobile endpoints and flag devices where the Samsung Account application version is below 15.7.01.1.
Review the Samsung Account manifest at runtime using tools such as adb shell dumpsys package com.osp.app.signin to identify exported components lacking permissions.
Correlate mobile device management (MDM) telemetry with the October 2026 Samsung Mobile patch level to identify unpatched fleets.

Monitoring Recommendations

Monitor for installation of untrusted APKs on devices that store Samsung Account credentials.
Track Samsung monthly security bulletin compliance through MDM reporting.
Alert on devices that remain below the October 2026 Samsung security patch level after a defined grace period.

How to Mitigate CVE-2026-21127

Immediate Actions Required

Update Samsung Account to version 15.7.01.1 or later through the Galaxy Store or system updates.
Apply the October 2026 Samsung Mobile Security Maintenance Release to all managed Samsung devices.
Restrict installation of unverified third-party applications through MDM policy until devices are patched.

Patch Information

Samsung published the fix in the October 2026 Security Maintenance Release. See the Samsung Mobile Security Update advisory for October 2026 for the full list of addressed issues and affected package versions. The patched Samsung Account version is 15.7.01.1.

Workarounds

Enforce an MDM policy that blocks sideloading and limits app installs to vetted sources until Samsung Account is updated.
Audit installed applications on Samsung devices and remove unknown or unnecessary packages that could invoke exported components.
Where feasible, sign out of Samsung Account on high-risk devices until the patched version is deployed.

bash

# Verify installed Samsung Account version on a managed device
adb shell dumpsys package com.osp.app.signin | grep versionName

# Confirm the device security patch level reflects October 2026
adb shell getprop ro.build.version.security_patch