What is CVE-2026-28663?

CVE-2026-28663 is a high-severity vulnerability in Google Android, classified under Incorrect Authorization. CVSS score: 7.8/10. Published 2026-09-08.

How severe is CVE-2026-28663?

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

Auth bypass in Google Android

CVE-2026-28663

In buildIntentSenderForUser of LauncherAppsService.java, there is a possible way to launch an activity from the background due to BAL Bypass. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.

Vulnerability class: Broken Access Control

Published 2026-09-08 · last modified 2026-09-23.

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 2026-10-24.

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 17.0, 17, 16

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

source.android.com/docs/security/bulletin/2026/2026-09-01 (Vendor Advisory)

Frequently asked questions

What is CVE-2026-28663?: CVE-2026-28663 is a high-severity vulnerability in Google Android, classified under Incorrect Authorization. CVSS score: 7.8/10. Published 2026-09-08.
How severe is CVE-2026-28663?: High severity. CVSS v3 base score is 7.8 out of 10.