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Samsung Watch Plugin CVE-2026-21109

| EUVDEUVD-2026-74650 LOW
Improper Access Control (CWE-284)
2026-09-09 SamsungMobile GHSA-v896-w4v4-33cj
2.1
CVSS 4.0 · Vendor: SamsungMobile

Severity by source

Vendor (SamsungMobile) PRIMARY
2.1 LOW
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/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
2.9 LOW

Local-only vector; AC:H reflects the AT:P prerequisite condition; PR:N per vendor 4.0 vector; only low confidentiality impact, no integrity or availability.

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

Primary rating from Vendor (SamsungMobile).

CVSS VectorVendor: SamsungMobile

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Metadata Corrected
Sep 09, 2026 - 08:40 vuln.today
tag: Google removed
Analysis Generated
Sep 09, 2026 - 08:36 vuln.today

DescriptionCVE.org

Improper access control in Watch Plugin prior to Android Watch 17 allows local attackers to access sensitive information.

AnalysisAI

Local information disclosure in Samsung Mobile's Watch Plugin for Android allows attackers with physical or local software access to read sensitive data from the device. Affected versions are all Watch Plugin releases prior to the Android Watch 17 patch, as confirmed by the Samsung Mobile security advisory. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Exploit
technique details hidden
Execution
technique details hidden
Impact
technique details hidden

Vulnerability AssessmentAI

Exploitation Requires local access to the Android device running a vulnerable version of Watch Plugin (prior to Android Watch 17 patch). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 2.1 (AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N) is consistent with real-world risk here: attack vector is strictly local, the only impact is low confidentiality disclosure, and specific attack prerequisites (AT:P) further constrain exploitability. … 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 Update Samsung Watch Plugin to the version bundled with or released alongside Android Watch 17, as specified in the Samsung Mobile security bulletin at https://security.samsungmobile.com/serviceWeb.smsb?year=2026&month=09. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-21109 vulnerability details – vuln.today

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