CVE-2026-28577

Local privilege escalation via unrestricted toast overlays

Published Jun 1, 2026 · Updated Jun 1, 2026

Improper UI-layer restriction in Android 14, 15, 16, and 16-qpr2 allows local users to elevate privileges through a toast overlay. WindowManagerService.addWindow accepts a TYPE_TOAST window on a nonempty WindowToken, permitting multiple toast windows where only one should be allowed. A low-privileged app can exploit the overlay without user interaction or additional execution privileges to obtain higher permissions on the device.

CVSS severity7.8
High
EPSS probability0.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper UI-layer restriction in Android 14, 15, 16, and 16-qpr2 allows local users to elevate privileges through a toast overlay. WindowManagerService.addWindow accepts a TYPE_TOAST window on a nonempty WindowToken, permitting multiple toast windows where only one should be allowed. A low-privileged app can exploit the overlay without user interaction or additional execution privileges to obtain higher permissions on the device.

The record

CVE
CVE-2026-28577
Published
Jun 1, 2026
Updated
Jun 1, 2026
Vendor
Go standard library
Product
Android
Classifications
CWE-1021, T1404
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=14
  2. Affected versionversion=15
  3. Affected versionversion=16
  4. Affected versionversion=16-qpr2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Go standard library · Androidversion=14; version=15; version=16; version=16-qpr2

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1021Improper Restriction of Rendered UI Layers or Frames
T1404Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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