CVE-2026-28613 Overview
CVE-2026-28613 is an input validation vulnerability in the initAppLinkTypeAndIntent method of ChannelImpl.java on Android. The flaw allows a local attacker to launch an arbitrary intent because the component fails to properly validate input passed to the app link handler. Successful exploitation results in local privilege escalation without requiring additional execution privileges. Exploitation does require user interaction, which limits opportunistic attack scenarios but does not prevent targeted abuse through malicious applications or crafted content. The issue is tracked under [CWE-20: Improper Input Validation] and is addressed in the Android Security Bulletin September 2026.
Critical Impact
A local attacker with limited privileges can trigger an arbitrary intent launch to escalate privileges on the affected Android device.
Affected Products
- Android (see Android Security Bulletin September 2026 for affected versions)
- Devices shipping the vulnerable ChannelImpl component
- OEM builds derived from the affected Android source
Discovery Timeline
- 2026-09-08 - CVE-2026-28613 published to NVD
- 2026-09-10 - Last updated in NVD database
Technical Details for CVE-2026-28613
Vulnerability Analysis
The vulnerability resides in the initAppLinkTypeAndIntent method of ChannelImpl.java. This method initializes the intent used when handling app links, but it does not adequately validate the intent data supplied by a caller. An unprivileged local application can craft input that causes the component to launch an intent chosen by the attacker.
Because the intent is launched from a more privileged execution context, the attacker inherits access to actions or components that would normally be restricted. This yields local escalation of privilege. The exploitation flow requires the victim user to interact with the application or UI element that triggers initAppLinkTypeAndIntent, such as tapping a link or launching an activity.
Root Cause
The root cause is improper input validation [CWE-20]. The initAppLinkTypeAndIntent routine trusts intent parameters that originate from a lower-privilege source without sanitizing the target component, action, or extras. This lets an attacker redirect the intent to a sensitive receiver or activity.
Attack Vector
The attack vector is local. A malicious application installed on the device supplies crafted values that are consumed by ChannelImpl during app link initialization. When the user interacts with the affected surface, the vulnerable code path fires the attacker-supplied intent in a privileged context. No additional execution privileges are needed beyond installing the malicious app.
No public proof-of-concept or in-the-wild exploitation has been reported. Technical specifics beyond the bulletin summary are not publicly disclosed. Refer to the Android Security Bulletin September 2026 for patch metadata and version mappings.
Detection Methods for CVE-2026-28613
Indicators of Compromise
- Unexpected activity launches originating from ChannelImpl or app link handling components in device logs.
- Installation of untrusted third-party APKs that request permissions or components tied to app link handling.
- Anomalous intent broadcasts targeting privileged system receivers shortly after user interaction with a suspicious app.
Detection Strategies
- Monitor Android build fingerprints and security patch levels across the fleet to identify devices missing the September 2026 patch.
- Inspect mobile telemetry for applications that register or invoke intents against internal system components without a legitimate use case.
- Correlate user-interaction events (link taps, activity launches) with subsequent privileged actions on the device.
Monitoring Recommendations
- Track app installations from outside the managed enterprise catalog and flag sideloaded packages.
- Alert on devices reporting a security patch level older than 2026-09-01.
- Review MDM compliance reports for devices that cannot receive vendor patches and prioritize replacement or restriction.
How to Mitigate CVE-2026-28613
Immediate Actions Required
- Apply the September 2026 Android security patch level (2026-09-01 or later) as soon as OEM builds are available.
- Restrict installation of applications from unknown sources through MDM policy.
- Educate users to avoid interacting with unsolicited links or prompts from untrusted applications.
Patch Information
The fix is included in the Android Security Bulletin dated September 2026. Device users and administrators should install updates that report a security patch level of 2026-09-01 or later. See the Android Security Bulletin September 2026 for the authoritative patch reference and source commits.
Workarounds
- Uninstall untrusted third-party applications, particularly those requesting broad intent-handling capabilities.
- Enforce Google Play Protect and equivalent OEM scanning to identify malicious packages.
- Apply enterprise mobility management policies that disable sideloading and restrict app link overrides on managed devices.
# Verify the security patch level on a connected Android device
adb shell getprop ro.build.version.security_patch
# Expected output: 2026-09-01 or later
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.