CVE-2026-28624 Overview
CVE-2026-28624 is a local privilege escalation vulnerability affecting multiple locations within the Android platform. The flaw is a confused deputy weakness [CWE-441] that permits read and write access to files without the required permissions. An attacker with local, low-privileged access can leverage a privileged component to perform file operations on protected resources. Exploitation requires no user interaction and no additional execution privileges. The issue is tracked in the Android Security Bulletin for September 2026.
Critical Impact
A local attacker can escalate privileges and gain unauthorized read/write access to protected files, compromising confidentiality, integrity, and availability of affected Android devices.
Affected Products
- Android platform (multiple locations, per the September 2026 Android Security Bulletin)
- Specific Android versions and components: Not Available in the NVD record
- Refer to the Android Security Bulletin September 2026 for the component list
Discovery Timeline
- 2026-09-08 - CVE-2026-28624 published to the National Vulnerability Database
- 2026-09-10 - Last updated in the NVD database
Technical Details for CVE-2026-28624
Vulnerability Analysis
The vulnerability is a confused deputy condition [CWE-441]. A privileged Android component performs file access on behalf of a less-privileged caller without properly validating whether the caller is authorized to access the target resource. The privileged process acts as a proxy, applying its own permissions rather than the caller's, which allows the caller to read or write files it would otherwise be denied.
Because the deputy runs with elevated privileges, the impact extends beyond the caller's original permission scope. The advisory notes the pattern appears in multiple locations, indicating a class of related issues rather than a single call site.
Root Cause
The root cause is insufficient authorization checking within a privileged Android service when handling file-access requests originating from other applications or components. The deputy fails to verify the caller's identity and permissions against the requested file resource before performing the operation.
Attack Vector
Exploitation is local. A malicious application installed on the device, running with minimal privileges, can invoke the vulnerable privileged interface. The attacker crafts requests that direct the deputy to read or write protected files, resulting in local escalation of privilege. No user interaction is required.
A public proof-of-concept is not listed in the enriched data. Technical specifics for each affected location are aggregated in the Android Security Bulletin September 2026.
Detection Methods for CVE-2026-28624
Indicators of Compromise
- Unexpected read or write operations on protected files by system services triggered from third-party application contexts
- Installation of unverified or sideloaded applications shortly before anomalous file-access events
- Log entries showing privileged service invocations followed by access to files outside the caller's sandbox
Detection Strategies
- Monitor Android system logs (logcat) for permission-mismatch events and privileged file operations initiated by low-privilege UIDs
- Correlate application install events with subsequent privileged file activity in mobile telemetry
- Apply behavioral analytics to flag applications invoking privileged inter-process interfaces at abnormal frequency
Monitoring Recommendations
- Ingest mobile device management (MDM) and endpoint telemetry into a centralized data lake for cross-device correlation
- Alert on newly installed apps requesting broad or sensitive permissions after the September 2026 patch level
- Track device patch-level compliance against the Android Security Bulletin baseline
How to Mitigate CVE-2026-28624
Immediate Actions Required
- Apply the Android security patch level dated 2026-09-01 or later on all managed devices
- Enforce patch-level compliance policies through MDM and block non-compliant devices from sensitive resources
- Audit installed applications and remove untrusted or sideloaded packages
Patch Information
Google addressed the vulnerability in the September 2026 Android security patch level. Device vendors ship the fix as part of their monthly security update rollouts. Consult the Android Security Bulletin September 2026 for patch identifiers and per-component references.
Workarounds
- Restrict installation to applications from vetted, trusted sources only
- Disable installation from unknown sources on managed devices via MDM policy
- Isolate high-risk users onto devices with current security patch levels until fleet-wide patching completes
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.