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Samsung Mobile EUVDEUVD-2026-26192

| CVE-2026-21023 MEDIUM
2026-04-29 SamsungMobile
6.9
CVSS 4.0 · Vendor: SamsungMobile
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Gain local device access
  2. Delivery
    Identify active installation restriction policy
  3. Exploit
    Craft data to spoof authenticity check
  4. Execution
    Submit crafted input to PackageManagerService
  5. Persist
    Bypass installation restriction
  6. Impact
    Install unauthorized application

Vulnerability Assessment

Exploitation Conditions

The attacker must have local access to the targeted Samsung Mobile Device running Android 14, 15, or 16 prior to SMR Mar-2026 Release 1. The CVSS 4.0 vector specifies PR:N, meaning no elevated Android permissions or special privileges are required beyond local device presence - a standard unprivileged app context may suffice. Exploitation is only meaningful against devices where installation restrictions are actively configured and enforced; without such restrictions in place, there is no policy to bypass and the practical impact is negligible. Remote exploitation is ruled out by the AV:L vector. SSVC's automatable: no designation indicates the attack cannot be trivially scripted for large-scale targeting, suggesting it requires deliberate, targeted effort against a specific device.

Impact

The CVSS 4.0 score of 6.9 with VI:H reflects meaningful integrity impact, but the local attack vector (AV:L) substantially constrains the exploitable population to attackers who already have device-level presence. EPSS is 0.00% at the 0th percentile - the lowest observable exploitation probability - and SSVC rates exploitation as none with automatable: no, confirming that no known active exploitation or mass-scalable attack path has been identified. KEV status is not confirmed. The CVSS 4.0 PR:N rating implies no special Android permissions are required beyond local presence, yet SSVC's automatable: no indicates this cannot be trivially scripted at scale, suggesting manual, targeted abuse. Real-world risk is concentrated in environments enforcing app installation restrictions through Samsung device MDM or parental controls; on devices without such restrictions actively configured, the exploitable impact is negligible. The intelligence tags include 'Information Disclosure,' which conflicts with the CVSS VI:H (integrity-only) rating and the description's focus on policy modification - this discrepancy is unexplained by available data and should be verified against the vendor advisory before classification decisions are made.

Exploit ScenarioDerived

A local attacker - either with physical access to a Samsung device or operating through a malicious application already resident on the device - submits crafted data to PackageManagerService that passes the insufficient authenticity check, allowing the restriction policy for a specific application to be modified. This enables installation of an application that would otherwise be blocked by enterprise MDM policy or parental controls. No public proof-of-concept code has been identified at time of analysis.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 24, 2026

PackageManagerService on Samsung Mobile Devices running Android 14, 15, and 16 allows local attackers without elevated privileges to bypass application installation restrictions by exploiting insufficient verification of data authenticity. The affected component fails to adequately validate the integrity of data governing app installation policies, enabling unauthorized modification of those restrictions on unpatched devices. No public exploit code has been identified and SSVC rates exploitation as none, but the impact is significant in enterprise MDM and parental-control deployments where installation restrictions are an active security control.

RemediationAI

Apply Samsung's SMR Mar-2026 Release 1 security update, which delivers the fix for Android 14, 15, and 16 per the vendor advisory at https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=03. Organizations managing Samsung device fleets via MDM should prioritize update deployment on any devices where application installation restrictions are an enforced security control, as those restrictions cannot be trusted on unpatched devices. As a compensating control where patching is delayed, supplement device-level installation restrictions with server-side MDM enforcement and network-based application allowlisting, since device-side restriction integrity is compromised on vulnerable builds. Note that these compensating controls add management overhead and may affect legitimate application deployment workflows.

Affected VersionsENISA

Samsung Mobile Devices patch: SMR Mar-2026 Release in Android 14, 15, 16

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Technical ContextAI · show details

PackageManagerService is a core Android system component responsible for managing application lifecycle events including installation, uninstallation, and enforcement of installation access policies. Samsung's proprietary Android build extends this service with custom installation restriction mechanisms. The vulnerability - no CWE is formally assigned, though functionally analogous to CWE-345 (Insufficient Verification of Data Authenticity) - means the service does not sufficiently validate the source or integrity of data that determines whether specific applications are permitted to install. The affected CPE is cpe:2.3:a:samsung_mobile:samsung_mobile_devices:*:*:*:*:*:*:*:*, covering Samsung's full Android device lineup across Android 14, 15, and 16. The CVSS 4.0 vector (AV:L/AC:L/AT:N/PR:N/UI:N) confirms low-complexity local exploitation with no attack requirements or prerequisites beyond device access.

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Severity by source

Vendor (SamsungMobile) PRIMARY 6.9 MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
vuln.today AI 5.5 MEDIUM

Local vector confirmed by AV:L; PR:L chosen because device presence or an installed app context is a practical prerequisite; C:N and A:N as no confidentiality or availability impact is described.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
4.0 AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (SamsungMobile).

CVSS VectorVendor: SamsungMobile

Attack Vector
Local
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Vulnerable system: Confidentiality
None
Vulnerable system: Integrity
High
Vulnerable system: Availability
None
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

Lifecycle Timeline

2
CVSS changed
Apr 29, 2026 - 05:59 NVD
6.9 (MEDIUM)
CVE Published
Apr 29, 2026 - 04:46 nvd
MEDIUM 6.9

DescriptionCVE.org

Insufficient verification of data authenticity in PackageManagerService prior to SMR Mar-2026 Release 1 allows local attackers to modify the installation restriction of specific application.

Threat Intelligence Overview

EPSS Score
0.0%
Top 100% exploitable
Prevalence
High
Samsung holds approximately 20% global smartphone market share
Social Media
1
Sightings
Data Quality
6 sources
Confidence: High

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Small
Automatable
No
Human Impact· derived
High
Technical Impact
Partial

Priority Score

34
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +34
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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