Local privilege escalation via unauthorized URI grant
Published Sep 8, 2026 · Updated Sep 10, 2026
Confused-deputy flaw in Android 16 QPR2 and 17 allows local users to escalate privileges through an unauthorized URI permission grant. AppWidgetConfigActivityProxy.onActivityResult accepts an activity result and grants URI access without adequately validating the result's authority. Exploitation requires local application execution but no additional execution privileges or user interaction, and the granted URI access enables privilege escalation.
Summary
What happened
Confused-deputy flaw in Android 16 QPR2 and 17 allows local users to escalate privileges through an unauthorized URI permission grant. AppWidgetConfigActivityProxy.onActivityResult accepts an activity result and grants URI access without adequately validating the result's authority. Exploitation requires local application execution but no additional execution privileges or user interaction, and the granted URI access enables privilege escalation.
The record
- CVE
- CVE-2026-28657
- Published
- Sep 8, 2026
- Updated
- Sep 10, 2026
- Vendor
- Google Cloud
- Product
- Android
- Classifications
- T1068
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 10, 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?
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- Affected versionversion=16-qpr2
- Affected versionversion=17
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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