CVE-2026-4219 Overview
A hard-coded credentials vulnerability has been discovered in the INDEX Conferences & Exhibitions Organization YWF BPOF APGCS App for Android versions up to 1.0.2. This vulnerability exists within the com/index/event/BuildConfig.java file of the ae.index.apgcs component, where manipulation of the ACCESS_KEY and HASH_KEY arguments can expose hard-coded credentials to local attackers.
Critical Impact
Local attackers with access to the Android device can extract hard-coded authentication credentials, potentially exposing backend secrets and compromising the security of the application's server-side infrastructure.
Affected Products
- INDEX Conferences & Exhibitions Organization YWF BPOF APGCS App version 1.0.2 and earlier
- Android platform installations of the APGCS application
- Component: ae.index.apgcs (com/index/event/BuildConfig.java)
Discovery Timeline
- 2026-03-16 - CVE-2026-4219 published to NVD
- 2026-03-16 - Last updated in NVD database
Technical Details for CVE-2026-4219
Vulnerability Analysis
This vulnerability falls under CWE-259 (Use of Hard-coded Password), a common security weakness in mobile application development. The flaw resides in the Android application's BuildConfig.java file, a standard Android class that contains compile-time configuration values. In this case, sensitive credentials including ACCESS_KEY and HASH_KEY values have been embedded directly into the application code.
Hard-coded credentials represent a significant security anti-pattern because they cannot be easily rotated without releasing a new application version, and they are accessible to anyone who can decompile or reverse-engineer the APK file. While the attack requires local access to the device, Android APK files can be extracted and analyzed on any system with appropriate tools.
The vendor, INDEX Conferences & Exhibitions Organization, was contacted regarding this vulnerability but did not respond. An exploit demonstrating the vulnerability has been published publicly.
Root Cause
The root cause of this vulnerability is the storage of sensitive authentication credentials directly within the application's source code in the BuildConfig.java file. This implementation choice violates secure coding practices that mandate secrets be stored securely (such as in encrypted storage or retrieved from a secure backend service) rather than compiled into the application binary.
The ACCESS_KEY and HASH_KEY parameters appear to be authorization credentials for backend API communication, and their exposure could allow unauthorized access to backend services and sensitive data.
Attack Vector
The attack vector is local, requiring the attacker to have access to an Android device with the application installed or access to the APK file itself. The attack methodology involves:
- Obtaining the APK file (from the device or app stores)
- Decompiling the application using standard Android reverse engineering tools (e.g., apktool, jadx, or dex2jar)
- Locating the com/index/event/BuildConfig.java file within the decompiled source
- Extracting the hard-coded ACCESS_KEY and HASH_KEY values
- Using these credentials to potentially access backend services
The vulnerability does not require special privileges beyond local access, and no user interaction is needed. The attacker gains read access to confidential credential data, though no direct integrity or availability impact exists at the local level.
Detection Methods for CVE-2026-4219
Indicators of Compromise
- Unusual API requests to backend services using extracted credentials
- Multiple authentication attempts from unrecognized sources or IP addresses
- Access logs showing credential usage from devices not associated with legitimate users
- Evidence of APK decompilation tools on enterprise-managed devices
Detection Strategies
- Monitor backend API authentication logs for anomalous access patterns using the affected credentials
- Implement API gateway monitoring to detect requests originating from non-mobile user agents
- Deploy mobile application management (MAM) solutions to detect unauthorized APK extraction or modification
- Conduct periodic security audits of Android applications for hard-coded secrets using static analysis tools
Monitoring Recommendations
- Establish baseline authentication patterns for the affected backend services
- Configure alerts for credential usage from unexpected geographic locations or IP ranges
- Monitor for any public disclosure of extracted credentials on threat intelligence feeds
- Track application download and installation metrics for unusual patterns
How to Mitigate CVE-2026-4219
Immediate Actions Required
- Rotate the affected ACCESS_KEY and HASH_KEY credentials on the backend immediately
- Implement IP allowlisting or additional authentication factors for API access where possible
- Audit backend access logs for any unauthorized access using the compromised credentials
- Consider temporarily disabling the affected API endpoints until proper credential management is implemented
Patch Information
No vendor patch is currently available. The vendor (INDEX Conferences & Exhibitions Organization) was contacted about this disclosure but did not respond. Users should monitor the Google Play Store or official vendor channels for application updates that address this vulnerability.
For additional technical details, refer to the VulDB advisory and the Notion blog post on backend credential exposure.
Workarounds
- Remove the application from enterprise-managed devices until a patch is available
- Implement network-level controls to restrict API access from the application to known, trusted endpoints
- Deploy mobile device management (MDM) policies to prevent APK extraction from managed devices
- If you operate the backend services, implement additional authentication mechanisms beyond the compromised credentials
# Example: Using static analysis to detect hard-coded secrets in Android APKs
# (For security teams auditing mobile applications)
# apktool d vulnerable_app.apk -o decompiled_app
# grep -r "ACCESS_KEY\|HASH_KEY" decompiled_app/
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
