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CVE-2026-21139 Samsung Mobile CVE debrief

CVE-2026-21139: Improper access control in Samsung Continuity Service for windows prior to version 4.6.1217.0 allows adjacent attackers to manipulate the connected mobile device. This vulnerability exists in the Samsung Continuity Service for windows, affecting its ability to properly control access, which could lead to unauthorized manipulation of connected mobile devices by adjacent attackers. The affected product versions are prior to 4.6.1217.0, and defenders should assess exposure and prioritize verification and upgrades.

Vendor
Samsung Mobile
Product
Samsung Continuity Service for windows
CVSS
HIGH 7.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-12
Original CVE updated
2026-10-12
Advisory published
2026-10-12
Advisory updated
2026-10-12

Who should care

Defenders responsible for managing and securing Samsung Continuity Service for windows installations should assess exposure and prioritize verification and upgrades.

Why it matters

Defenders should prioritize verifying and upgrading Samsung Continuity Service for windows to prevent adjacent attackers from manipulating connected mobile devices.

  • Adjacent attackers may manipulate connected mobile devices
  • Exposure requires verification and upgrade to version 4.6.1217.0 or later

Technical summary

The vulnerability exists in Samsung Continuity Service for windows prior to version 4.6.1217.0, allowing adjacent attackers to manipulate the connected mobile device due to improper access control. This issue affects the service's ability to secure communications between the mobile device and the Windows system. Defenders should prioritize verifying and upgrading Samsung Continuity Service for windows to version 4.6.1217.0 or later to mitigate this vulnerability.

Defensive priority

Defenders should prioritize verifying and upgrading Samsung Continuity Service for windows to version 4.6.1217.0 or later, and assess exposure in their environment.

Recommended defensive actions

  • Verify and upgrade Samsung Continuity Service for windows to version 4.6.1217.0 or later
  • Assess exposure in the environment
  • Monitor for adjacent attackers attempting to manipulate connected mobile devices

Evidence notes

The CVE record and source item provide limited information about the vulnerability, confirming it exists in versions prior to 4.6.1217.0. Defenders should verify and upgrade Samsung Continuity Service for windows to prevent adjacent attackers from manipulating connected mobile devices. Evidence is limited to CVE metadata and source item details, with no additional public information available for further analysis.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-21139 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-21139

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-21139 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-21139

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • CVE-2026-21139

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/21xxx/CVE-2026-21139.json

    cve_program_cvelist_v5

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.