---
title: "CVE-2026-21100: SystemUI - Broken Access Control"
description: "SystemUI prior to SMR Sep-2026 Release 1 contains an improper access control vulnerability caused by insufficient restrictions, letting local attackers launch arbitrary activities, exploit requires local access."
url: https://panop.io/threat-heartbeat/CVE-2026-21100/
---

# CVE-2026-21100 SystemUI - Broken Access Control

SystemUI prior to SMR Sep-2026 Release 1 contains an improper access control vulnerability caused by insufficient restrictions, letting local attackers launch arbitrary activities, exploit requires local access.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.09% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-21100)

## Details

Type

Broken Access Control

Impact

Privilege Escalation

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Published

9 September 2026

Updated

15 October 2026

Weakness

[CWE-284](https://cwe.mitre.org/data/definitions/284.html)

## Vendor fix

Update to SMR Sep-2026 Release 1 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-2026-21100](https://nvd.nist.gov/vuln/detail/CVE-2026-21100)
- [https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=09](https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=09)

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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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