What is CVE-2023-20959?

CVE-2023-20959 is a high-severity vulnerability in Google Android, classified under Missing Authorization. CVSS score: 7.8/10. Published 2023-03-24.

How severe is CVE-2023-20959?

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

Auth bypass in Google Android

CVE-2023-20959

In AddSupervisedUserActivity, guest users are not prevented from starting the activity due to missing permissions checks. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-13Android ID: A-249057848

Vulnerability class: Broken Access Control

Published 2023-03-24 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.001 (0.4th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 0th percentile — 0.4% 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

Google Android — versions 13.0
Android — versions Android-13

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

source.android.com/security/bulletin/2023-03-01 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-20959?: CVE-2023-20959 is a high-severity vulnerability in Google Android, classified under Missing Authorization. CVSS score: 7.8/10. Published 2023-03-24.
How severe is CVE-2023-20959?: High severity. CVSS v3 base score is 7.8 out of 10.