---
title: "CVE-2026-21139: Samsung Continuity Service - Broken Access Control"
description: "Samsung Continuity Service for Windows < 4.6.1217.0 contains an improper access control vulnerability caused by insufficient restrictions, letting adjacent attackers manipulate connected mobile devices, exploit requires network adjacency."
url: https://panop.io/threat-heartbeat/CVE-2026-21139/
---

# CVE-2026-21139 Samsung Continuity Service - Broken Access Control

Samsung Continuity Service for Windows < 4.6.1217.0 contains an improper access control vulnerability caused by insufficient restrictions, letting adjacent attackers manipulate connected mobile devices, exploit requires network adjacency.

CVSS base score 7.3 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.12% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-21139)

## Details

Type

Broken Access Control

Impact

Broken Access Control, Data Tampering

CVSS vector

CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H/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

Published

12 October 2026

Updated

15 October 2026

## Vendor fix

Update to version 4.6.1217.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-21139](https://nvd.nist.gov/vuln/detail/CVE-2026-21139)
- [https://security.samsungmobile.com/serviceWeb.smsb?year=2026&month=10](https://security.samsungmobile.com/serviceWeb.smsb?year=2026&month=10)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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