CVE-2026-5457: PropertyGuru AgentNet Information Disclosure

CVE-2026-5457 Overview

A security vulnerability has been discovered in the PropertyGuru AgentNet Singapore App for Android up to version 23.7.10. The vulnerability exists in the com/allproperty/android/agentnet/BuildConfig.java file within the com.allproperty.android.agentnet component. The flaw involves the use of hard-coded cryptographic keys in the SEGMENT_ANDROID_WRITE_KEY and SEGMENT_TOS_WRITE_KEY arguments, potentially enabling attackers to exploit exposed Segment write keys for data injection and user profile manipulation.

Critical Impact

Hard-coded Segment API write keys can be extracted from the application, potentially allowing attackers with local access to inject unauthorized analytics data or manipulate user tracking profiles within the Segment analytics platform.

Affected Products

• PropertyGuru AgentNet Singapore App for Android up to version 23.7.10
• com.allproperty.android.agentnet component
• Applications utilizing exposed Segment write keys in BuildConfig

Discovery Timeline

• 2026-04-03 - CVE-2026-5457 published to NVD
• 2026-04-03 - Last updated in NVD database

Technical Details for CVE-2026-5457

Vulnerability Analysis

This vulnerability falls under CWE-320 (Key Management Errors), specifically involving the use of hard-coded cryptographic keys within the application's build configuration. The Segment write keys (SEGMENT_ANDROID_WRITE_KEY and SEGMENT_TOS_WRITE_KEY) are embedded directly in the BuildConfig.java file, making them accessible to anyone who can decompile the Android APK.

The exposure of these Segment API keys creates a pathway for unauthorized interaction with the application's analytics infrastructure. While the attack requires local access to the device or application package, the exposed keys could enable an attacker to send arbitrary tracking events to the Segment platform or manipulate user profile data associated with the application's analytics.

Root Cause

The root cause of this vulnerability is improper key management practices where sensitive API credentials are compiled directly into the application source code rather than being securely stored or dynamically retrieved. Hard-coding secrets in BuildConfig.java is a common anti-pattern in Android development that exposes credentials to anyone capable of reverse engineering the APK using tools like jadx, apktool, or similar decompilation utilities.

Attack Vector

The attack vector is local, requiring the attacker to have access to the Android device or the APK file itself. An attacker would need to:

1. Obtain the PropertyGuru AgentNet Singapore APK (either from the device or by downloading from an app store)
2. Decompile the application using Android reverse engineering tools
3. Locate the BuildConfig.java file and extract the hard-coded Segment write keys
4. Use the extracted keys to interact with the Segment analytics API

The vulnerability mechanism involves extracting hard-coded credentials from compiled Android application code. The Segment write keys are stored as string constants in the BuildConfig class, which can be recovered through standard APK decompilation. Once extracted, these keys could potentially be used to inject false analytics data or interact with the Segment platform's API endpoints. For detailed technical analysis, see the Notion Security Analysis.

Detection Methods for CVE-2026-5457

Indicators of Compromise

• Unusual or anomalous analytics events appearing in Segment dashboard that do not correlate with legitimate user activity
• API calls to Segment endpoints originating from unexpected IP addresses or geographic locations
• Spike in analytics data volume or patterns inconsistent with normal application usage
• Evidence of APK decompilation tools or reverse engineering activity on devices

Detection Strategies

• Monitor Segment analytics dashboard for anomalous event patterns or unexpected data injection
• Implement server-side validation for critical analytics events to detect potentially spoofed data
• Review application logs for unusual API interaction patterns
• Conduct periodic security audits of Android applications for hard-coded credentials

Monitoring Recommendations

• Enable detailed logging on Segment API endpoints to track the source of analytics requests
• Set up alerts for unusual spikes in analytics event volume or new event types
• Monitor application distribution channels for unauthorized APK modifications
• Implement rate limiting on analytics endpoints to detect and prevent abuse

How to Mitigate CVE-2026-5457

Immediate Actions Required

• Update the PropertyGuru AgentNet Singapore App to a version newer than 23.7.10 when a patched version becomes available
• Rotate all exposed Segment write keys immediately to invalidate any extracted credentials
• Review Segment analytics data for signs of unauthorized data injection
• Consider implementing additional server-side validation for critical analytics events

Patch Information

The vendor was contacted about this disclosure but did not respond. No official patch information is currently available. Users should monitor the PropertyGuru AgentNet Singapore App updates on the Google Play Store for security fixes. Additional vulnerability details can be found in the VulDB Vulnerability Entry.

Workarounds

• Remove or uninstall the affected application until a patched version is available
• Implement network-level monitoring to detect unauthorized API calls to Segment endpoints
• If you are the application developer, migrate to secure key storage solutions such as Android Keystore or server-side key retrieval
• Consider implementing certificate pinning and code obfuscation to make reverse engineering more difficult

# Example: Rotate Segment write keys via Segment API (requires admin access)
# After rotating, update your secure key storage and redeploy the application
# Note: This invalidates all existing write keys - coordinate with development team

# Verify current Segment source configuration
curl -X GET "https://api.segment.io/v1/sources/<source_id>" \
  -H "Authorization: Bearer <admin_token>"

# Generate new write key through Segment dashboard or API
# Update server-side key storage (not in application code)
# Redeploy application with secure key retrieval mechanism