CVE-2025-49755: Microsoft Edge Auth Bypass Vulnerability

CVE-2025-49755 Overview

CVE-2025-49755 is a user interface spoofing vulnerability in Microsoft Edge for Android. The flaw allows an unauthorized attacker to misrepresent critical information in the browser interface over a network. Microsoft categorizes the issue under CWE-451, which covers user interface misrepresentation of critical information.

Exploitation requires user interaction, such as visiting an attacker-controlled page. A successful attack undermines the integrity of information displayed to the user, enabling phishing and deception scenarios. No authentication is required, and the attack occurs entirely across the network.

Critical Impact
An attacker can spoof trusted UI elements in Microsoft Edge for Android, enabling convincing phishing pages that appear legitimate to victims.

Affected Products

Microsoft Edge for Android (browser application on the Android platform)
Deployments distributed through the Google Play Store prior to the patched release
Enterprise-managed Android devices using Microsoft Edge as the default browser

Discovery Timeline

2025-08-12 - CVE-2025-49755 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-49755

Vulnerability Analysis

The vulnerability belongs to the User Interface Confusion class of flaws, tracked as CWE-451. Microsoft Edge for Android renders security-relevant UI components in a way that can be manipulated by attacker-controlled web content. When a user visits a crafted page, the browser can display information that misrepresents the actual origin, security state, or content source.

The attack chain begins when a victim navigates to a malicious page or follows a crafted link. The page then leverages the rendering flaw to overlay, obscure, or replace trusted browser UI indicators. Because the manipulation occurs within Edge's own interface, users have limited visual cues to detect the deception.

The impact centers on integrity rather than confidentiality or availability. Attackers can convince users that they are interacting with a trusted site, harvesting credentials or triggering unsafe actions.

Root Cause

The root cause is improper separation between web-rendered content and security-critical UI chrome in Microsoft Edge for Android. The browser fails to guarantee that indicators such as address bar contents or origin information cannot be influenced by page content. This design gap enables spoofing over the network.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker hosts a malicious page and lures victims through phishing links, malvertising, or compromised sites. Once loaded in Microsoft Edge for Android, the page manipulates UI elements to impersonate legitimate content. The attacker requires no privileges on the target device.

No verified public exploit code is available for this issue. Refer to the Microsoft Security Update CVE-2025-49755 advisory for vendor guidance.

Detection Methods for CVE-2025-49755

Indicators of Compromise

Reports from users of address bar or origin indicators that appear inconsistent with page content in Microsoft Edge for Android
Increased credential submission activity to unexpected external domains from mobile Edge user agents
Referrer patterns showing traffic from short-lived or newly registered domains directed at authentication endpoints

Detection Strategies

Monitor mobile web proxy and DNS telemetry for user agents matching outdated versions of Microsoft Edge for Android
Correlate phishing report submissions with sessions originating from Edge Android clients to identify targeted campaigns
Track anomalous authentication attempts that follow visits to newly seen domains from mobile Edge browsers

Monitoring Recommendations

Enforce mobile device management (MDM) reporting on installed Edge versions to identify unpatched endpoints
Ingest browser and network telemetry into a centralized analytics platform for correlation across users
Alert on phishing domains hosting URL patterns designed to trigger UI overlay behavior in mobile browsers

How to Mitigate CVE-2025-49755

Immediate Actions Required

Update Microsoft Edge for Android to the latest version available through the Google Play Store
Push the updated browser build to all managed Android endpoints through MDM or enterprise mobility management tooling
Communicate phishing awareness guidance to mobile users, emphasizing verification of destination URLs before entering credentials

Patch Information

Microsoft has addressed CVE-2025-49755 in a security update for Microsoft Edge on Android. Consult the Microsoft Security Update CVE-2025-49755 advisory for the exact fixed version and release notes. Deploy the update through the Google Play Store or your enterprise app distribution channel.

Workarounds

Restrict use of Microsoft Edge for Android on managed devices until the patched version is deployed
Configure enterprise browsers to block navigation to uncategorized or newly registered domains on mobile endpoints
Enable phishing and malicious site protection features in the Edge mobile client where supported

bash

# Verify installed Microsoft Edge for Android version via ADB
adb shell dumpsys package com.microsoft.emmx | grep versionName