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Samsung Message CVE-2026-21070

| EUVDEUVD-2026-55095 MEDIUM
Improper Input Validation (CWE-20)
2026-08-10 SamsungMobile GHSA-cqww-5wfg-hfpv
Information Disclosure Samsung Samsung Mobile Devices
5.1
CVSS 4.0 · Vendor: SamsungMobile
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Severity by source

Vendor (SamsungMobile) PRIMARY
5.1 MEDIUM
CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
4.3 MEDIUM

Physical vector confirmed; no privileges required to initiate access; user interaction implied by UI:A in source vector; confidentiality-only impact with no integrity or availability effect.

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

Primary rating from Vendor (SamsungMobile).

CVSS VectorVendor: SamsungMobile

Attack Vector
Physical
Attack Complexity
Low
Privileges Required
None
User Interaction
A
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 10, 2026 - 09:06 vuln.today
CVE Published
Aug 10, 2026 - 07:41 cve.org
MEDIUM 5.1

DescriptionCVE.org

Improper input validation in Samsung Message prior to SMR Aug-2026 Release 1 allows physical attackers to access sensitive information.

AnalysisAI

Samsung Message on Android devices prior to SMR Aug-2026 Release 1 exposes sensitive user information to physical attackers through improper input validation. An attacker with physical access to an unlocked or accessible device can interact with the Samsung Message application to trigger the flaw and read confidential message content or related data. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Execution
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Vulnerability AssessmentAI

Exploitation Physical access to the target Samsung device is required - this is not remotely exploitable under any known configuration. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 5.1 reflects a moderate severity constrained almost entirely by the physical access requirement (AV:P), which dramatically limits the realistic attacker population. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the Samsung SMR Aug-2026 Release 1 security update, which contains the fix for this vulnerability. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-21070 vulnerability details – vuln.today
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