CVE-2026-30289: Tinybeans Private Family Album RCE Flaw

CVE-2026-30289 Overview

An arbitrary file overwrite vulnerability has been identified in Tinybeans Private Family Album App version 5.9.5-prod for Android. This vulnerability allows attackers to overwrite critical internal files through the file import process, which can lead to arbitrary code execution or information exposure. The flaw is classified under CWE-73 (External Control of File Name or Path), indicating that the application fails to properly validate or sanitize file paths during import operations.

Critical Impact

Successful exploitation enables attackers to overwrite protected application files, potentially leading to arbitrary code execution within the application context or exposure of sensitive family photos and personal data stored in the app.

Affected Products

• Tinybeans Private Family Album App version 5.9.5-prod for Android
• Android mobile devices running the affected application version

Discovery Timeline

• 2026-04-01 - CVE-2026-30289 published to NVD
• 2026-04-02 - Last updated in NVD database

Technical Details for CVE-2026-30289

Vulnerability Analysis

This vulnerability stems from improper handling of file paths during the file import process within the Tinybeans Private Family Album application. The application fails to adequately validate or sanitize user-controlled file names and paths when importing files, allowing an attacker to craft malicious input that references paths outside the intended directory structure.

The local attack vector means an attacker requires either physical access to the device or must leverage another application or component on the same device to exploit this vulnerability. No user interaction is required for exploitation, which increases the severity of potential attacks.

Root Cause

The root cause is classified as CWE-73: External Control of File Name or Path. The application's file import functionality does not properly validate incoming file paths, failing to prevent directory traversal sequences or absolute path specifications. This allows attackers to specify arbitrary file paths that point to sensitive internal application files or system directories accessible to the application.

The vulnerability likely exists in the code path that handles file import operations, where user-supplied or externally-sourced file names are used directly without sanitization to construct file system paths for write operations.

Attack Vector

The attack leverages the local attack surface of the Android application. An attacker can exploit this vulnerability through several potential vectors:

1. Malicious File Import: Crafting a specially named file with directory traversal sequences (e.g., ../../sensitive_file) that, when imported, overwrites critical application files
2. Intent Manipulation: If the file import accepts data from other applications via Android Intents, a malicious app could send crafted file path data
3. Compromised Storage: Placing maliciously named files in directories that the application scans for import

The vulnerability allows overwriting files within the application's sandbox and potentially any files the application has permission to access, leading to code execution if executable files or configuration files are overwritten.

For detailed technical information, see the GitHub Issue Tracker Entry maintained by the Secsys research team at Fudan University.

Detection Methods for CVE-2026-30289

Indicators of Compromise

• Unexpected modifications to application internal files or configuration data
• Presence of files with directory traversal patterns (e.g., ../, ..\\) in import directories
• Crash logs indicating file permission errors during import operations
• Unusual file system activity within the Tinybeans application data directory

Detection Strategies

• Monitor file system operations for path traversal patterns in file names being written by the application
• Implement integrity monitoring on critical application files to detect unauthorized modifications
• Review Android application logs for abnormal file import activities or error patterns
• Deploy mobile threat detection solutions capable of identifying path traversal exploitation attempts

Monitoring Recommendations

• Enable verbose logging for the Tinybeans application to capture file import operations
• Monitor for any unexpected changes to application preferences, databases, or native libraries
• Set up alerts for file system operations that attempt to write outside designated directories
• Regularly audit installed application versions against known vulnerable releases

How to Mitigate CVE-2026-30289

Immediate Actions Required

• Update the Tinybeans Private Family Album application to the latest version available on the Google Play Store if a patched version is available
• Review any recently imported files for suspicious naming patterns
• Consider temporarily disabling or restricting file import functionality until a patch is applied
• Remove version 5.9.5-prod if no patch is available and the application is not critical

Patch Information

At the time of publication, no vendor advisory or official patch information has been released. Users should monitor the Tinybeans Website and the Google Play Store for security updates. The vulnerability was documented by researchers at Secsys Fudan University.

Workarounds

• Restrict the application's ability to import files from untrusted sources
• Avoid importing files from unknown or untrusted origins into the application
• Use Android's work profile or managed device features to isolate the application if available
• Consider alternative family album applications until a security patch is released

# Verify installed application version on Android
adb shell dumpsys package com.tinybeans | grep versionName

# Check for suspicious files in application storage (requires root or adb backup)
adb shell ls -la /data/data/com.tinybeans/files/