What is CVE-2026-20991?

CVE-2026-20991 is a medium-severity vulnerability in Samsung Android, classified under CWE-269 IMPROPER PRIVILEGE MANAGEMENT. CVSS score: 4.4/10. Published 2026-03-16.

How severe is CVE-2026-20991?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Vulnerability in Samsung Android

CVE-2026-20991

Improper privilege management in ThemeManager prior to SMR Mar-2026 Release 1 allows local privileged attackers to reuse trial contents.

Published 2026-03-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.001 (1.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.6% 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-2026-20991?: CVE-2026-20991 is a medium-severity vulnerability in Samsung Android, classified under CWE-269 IMPROPER PRIVILEGE MANAGEMENT. CVSS score: 4.4/10. Published 2026-03-16.
How severe is CVE-2026-20991?: Medium severity. CVSS v3 base score is 4.4 out of 10.