What is CVE-2026-21023?

CVE-2026-21023 is a medium-severity vulnerability in Samsung Android, classified under CWE-345: INSUFFICIENT VERIFICATION OF DATA AUTHENTICITY. CVSS score: 5.5/10. Published 2026-04-29.

How severe is CVE-2026-21023?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Samsung Android

CVE-2026-21023

Insufficient verification of data authenticity in PackageManagerService prior to SMR Mar-2026 Release 1 allows local attackers to modify the installation restriction of specific application.

Published 2026-04-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.001 (0.9th percentile), scored 2026-09-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 0.9% 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
Samsung Mobile Devices — versions SMR Mar-2026 Release in Android 14, 15, 16

References

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

Frequently asked questions

What is CVE-2026-21023?: CVE-2026-21023 is a medium-severity vulnerability in Samsung Android, classified under CWE-345: INSUFFICIENT VERIFICATION OF DATA AUTHENTICITY. CVSS score: 5.5/10. Published 2026-04-29.
How severe is CVE-2026-21023?: Medium severity. CVSS v3 base score is 5.5 out of 10.