CVE-2025-15464: Gmail Auth Bypass Vulnerability

CVE-2025-15464 Overview

CVE-2025-15464 is a vulnerability affecting Android applications where an exported Activity allows external applications to gain application context and directly launch Gmail with inbox access, bypassing security controls. This vulnerability stems from improper access control on Android components (CWE-926: Improper Export of Android Application Components), which allows malicious applications to interact with sensitive functionality that should be restricted.

Critical Impact

Malicious applications can exploit this vulnerability to access Gmail inbox content without proper authorization, potentially exposing sensitive email communications and attachments to unauthorized parties.

Affected Products

• Gmail for Android (specific affected versions not disclosed)
• Android devices running the vulnerable Gmail application

Discovery Timeline

• 2026-01-08 - CVE CVE-2025-15464 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-15464

Vulnerability Analysis

This vulnerability falls under CWE-926 (Improper Export of Android Application Components), which occurs when an Android application component such as an Activity is exported without proper access restrictions. In this case, the exported Activity in Gmail allows external applications to launch the email client directly into the inbox view, bypassing the normal authentication and authorization flow.

The attack requires no user interaction and can be exploited over the network. The vulnerability primarily impacts confidentiality, as attackers can potentially access sensitive email content. The exported Activity can be invoked by any application on the device, regardless of whether that application should have access to email functionality.

Root Cause

The root cause of this vulnerability is the improper configuration of Android component export settings. When an Activity is marked as exported in the AndroidManifest.xml without adequate permission checks or intent filters, any application on the device can invoke that Activity. This design flaw allows malicious applications to piggyback on Gmail's application context to access inbox data that would normally require explicit user authorization.

Attack Vector

The attack vector involves a malicious Android application crafting an Intent to launch the exported Gmail Activity. The vulnerability exploits the network attack vector as defined in the CVSS specification, with low attack complexity requiring no privileges or user interaction.

An attacker would deploy a malicious application that, once installed on the target device, sends an explicit Intent to the vulnerable exported Activity. This grants the malicious application access to Gmail's application context, allowing it to view inbox content directly. The KoreLogic Security Advisory provides detailed technical information about the exploitation mechanism, and a proof-of-concept is available demonstrating the attack.

Detection Methods for CVE-2025-15464

Indicators of Compromise

• Unusual Intent activity targeting Gmail components from third-party applications
• Applications with suspicious permissions attempting to interact with email components
• Log entries showing unexpected Activity launches in Gmail from external packages
• User reports of email content appearing in unauthorized applications

Detection Strategies

• Monitor Android system logs for Intent broadcasts targeting Gmail's exported Activities from untrusted packages
• Implement application behavior analysis to detect applications attempting to access Gmail components without user interaction
• Deploy mobile threat defense solutions capable of identifying malicious inter-process communication patterns
• Review installed applications for suspicious Intent filter declarations that target Gmail components

Monitoring Recommendations

• Enable verbose logging on managed devices to capture Intent activity between applications
• Implement SentinelOne Mobile Threat Defense to detect anomalous application behavior and unauthorized component access
• Configure alerts for applications attempting to launch Gmail Activities programmatically
• Regularly audit installed applications for potential exploit attempts

How to Mitigate CVE-2025-15464

Immediate Actions Required

• Update Gmail for Android to the latest available version from the Google Play Store
• Review and restrict application installations to trusted sources only
• Deploy mobile device management (MDM) solutions to enforce security policies
• Consider removing Gmail from devices in high-security environments until a patch is confirmed

Patch Information

Users should check the Google Play Store for Gmail updates that address this vulnerability. Refer to the KoreLogic Security Advisory KL-001-2026-001 and the Full Disclosure mailing list post for the latest information regarding vendor response and patch availability.

Workarounds

• Restrict installation of untrusted applications by enabling "Install unknown apps" protection in Android settings
• Use Android's Work Profile feature to isolate Gmail in a managed container
• Implement application whitelisting through MDM to prevent malicious applications from being installed
• Consider using Gmail only through the web interface on affected devices until patched

# Android Debug Bridge command to check Gmail component export status
adb shell dumpsys package com.google.android.gm | grep -A 5 "exported"

# Verify no unauthorized applications have declared intent filters for Gmail
adb shell pm list packages -f | xargs -I {} adb shell dumpsys package {} | grep -i "gmail"