What is CVE-2026-21100?

CVE-2026-21100 is a high-severity vulnerability in Samsung Android, classified under Improper Access Control. CVSS score: 7.1/10. Published 2026-09-09.

How severe is CVE-2026-21100?

High severity. CVSS v3 base score is 7.1 out of 10.

Vulnerability in Samsung Android

CVE-2026-21100

Improper access control in SystemUI prior to SMR Sep-2026 Release 1 allows local attackers to launch arbitrary activity.

Published 2026-09-09 · last modified 2026-09-10.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.001 (0.5th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 0.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000

Affected products

Samsung Android — versions 14.0, 15.0, 16.0

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

security.samsungmobile.com/securityUpdate.smsb (Vendor Advisory)

Frequently asked questions

What is CVE-2026-21100?: CVE-2026-21100 is a high-severity vulnerability in Samsung Android, classified under Improper Access Control. CVSS score: 7.1/10. Published 2026-09-09.
How severe is CVE-2026-21100?: High severity. CVSS v3 base score is 7.1 out of 10.