CVE-2025-62223: Microsoft Edge iOS Auth Bypass Flaw

CVE-2025-62223 Overview

CVE-2025-62223 is a user interface spoofing vulnerability in Microsoft Edge for iOS. The flaw stems from the browser misrepresenting critical information in its user interface, which allows an unauthorized attacker to perform spoofing attacks over a network. Microsoft classifies this issue under CWE-451, which covers UI misrepresentation of critical information. Exploitation requires user interaction, such as visiting an attacker-controlled page or interacting with crafted content. The vulnerability affects the integrity of information presented to the user without directly impacting confidentiality or availability.

Critical Impact
An attacker can manipulate the Edge for iOS interface to deceive users about the origin or trustworthiness of displayed content, enabling phishing and social engineering attacks.

Affected Products

Microsoft Edge for iOS (Chromium-based)
cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*
Mobile Edge builds prior to the fixed release documented in Microsoft's advisory

Discovery Timeline

2025-12-05 - CVE-2025-62223 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-62223

Vulnerability Analysis

The vulnerability is a User Interface Confusion issue in Microsoft Edge for iOS. The browser fails to correctly represent security-relevant information in its user interface. An attacker with network reach can craft web content that causes Edge to display misleading indicators, such as an incorrect address bar state, URL, or security context. This class of flaw maps to CWE-451: User Interface (UI) Misrepresentation of Critical Information.

Because the attack takes place inside the mobile browser, users have limited ability to inspect underlying page context compared to a desktop environment. This increases the practical effectiveness of spoofing. The vulnerability does not grant code execution or direct data access. Instead, it enables convincing phishing pages, fake login prompts, or fraudulent transaction dialogs.

Root Cause

The root cause is improper synchronization between the content rendered by the WebView and the browser chrome that reports its origin. When specific conditions are met, Edge for iOS presents UI elements that do not reflect the actual state of the loaded resource. Microsoft has not disclosed the exact rendering path or race condition involved.

Attack Vector

The attack vector is network-based and requires user interaction. A victim must navigate to a malicious page or follow a crafted link. Once loaded, the page manipulates browser behavior to produce a deceptive interface. No authentication is required for the attacker. See the Microsoft Security Update CVE-2025-62223 advisory for vendor-specific details.

No public proof-of-concept exploit code is available. This article does not include synthetic exploitation samples.

Detection Methods for CVE-2025-62223

Indicators of Compromise

Mobile Edge users reporting mismatches between the displayed URL and the actual page content
Phishing pages referenced by internal telemetry that specifically target iOS Edge user agents
Credential submissions from mobile browsers to domains not matching the displayed address bar

Detection Strategies

Inspect mobile web proxy and DNS logs for user visits to newly registered domains impersonating internal login portals
Correlate authentication events from iOS Edge user agents with unusual source IPs or geographies
Review email and messaging gateways for links that render differently in mobile Edge than in desktop browsers

Monitoring Recommendations

Track Microsoft Edge for iOS version distribution across managed mobile devices
Alert on failed or anomalous authentication attempts originating from mobile Edge sessions
Monitor Microsoft Security Response Center advisories for updates to CVE-2025-62223

How to Mitigate CVE-2025-62223

Immediate Actions Required

Update Microsoft Edge for iOS to the latest version available in the Apple App Store
Enforce mobile device management policies that require current browser versions on managed devices
Communicate phishing awareness guidance to users, emphasizing verification of URLs on mobile browsers

Patch Information

Microsoft has published guidance and a fixed release in the Microsoft Security Update CVE-2025-62223 advisory. Users should install the updated Edge for iOS build from the App Store. No configuration changes are required beyond applying the update.

Workarounds

Restrict use of Microsoft Edge for iOS on high-risk mobile devices until the update is applied
Route corporate mobile browsing through a secure web gateway that blocks known phishing infrastructure
Require multi-factor authentication on all corporate services to reduce the impact of credential theft via spoofed pages

bash

# Example MDM query to identify vulnerable Edge for iOS installs
# Replace <fixed_version> with the version listed in the MSRC advisory
mdm-cli devices list \
  --filter "app.bundle_id=com.microsoft.msedge AND app.version<<fixed_version>>" \
  --output table