What is CVE-2026-21031?

CVE-2026-21031 is a high-severity vulnerability in Samsung Android, classified under Incorrect Authorization. CVSS score: 7.8/10. Published 2026-06-05.

How severe is CVE-2026-21031?

High severity. CVSS v3 base score is 7.8 out of 10.

Auth bypass in Samsung Android

CVE-2026-21031

Improper authorization in AppBlock prior to SMR Jun-2026 Release 1 allows local attacker to launch arbitrary activity. User interaction is required for triggering this vulnerability.

Vulnerability class: Broken Access Control

Published 2026-06-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.001 (0.5th percentile), scored 2026-09-29.

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 15.0, 16.0
Samsung Mobile Devices — versions SMR Jun-2026 Release in Android 15, 16

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

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

Frequently asked questions

What is CVE-2026-21031?: CVE-2026-21031 is a high-severity vulnerability in Samsung Android, classified under Incorrect Authorization. CVSS score: 7.8/10. Published 2026-06-05.
How severe is CVE-2026-21031?: High severity. CVSS v3 base score is 7.8 out of 10.