CVE-2024-30057: Microsoft Edge iOS Spoofing Vulnerability

CVE-2024-30057 Overview

CVE-2024-30057 is a spoofing vulnerability affecting Microsoft Edge for iOS. The flaw allows attackers to misrepresent security-relevant user interface elements to victims over a network attack vector. Exploitation requires user interaction, such as clicking a crafted link or visiting an attacker-controlled page. Microsoft classified the issue under CWE-356: Product UI does not Warn User of Unsafe Actions, indicating the browser fails to adequately convey trust context to the user. The vulnerability affects only the iOS build of Microsoft Edge and does not impact desktop variants.

Critical Impact
Attackers can craft content that spoofs trusted UI elements in Microsoft Edge for iOS, enabling phishing and credential theft against users who interact with malicious links.

Affected Products

Microsoft Edge for iOS (iPhone OS)
CPE: cpe:2.3:a:microsoft:edge:*:*:*:*:*:iphone_os:*:*
Non-patched builds prior to the Microsoft security update referenced in the advisory

Discovery Timeline

2024-06-13 - CVE-2024-30057 published to the National Vulnerability Database
2026-07-20 - Last updated in the NVD database

Technical Details for CVE-2024-30057

Vulnerability Analysis

The vulnerability resides in how Microsoft Edge for iOS renders security-relevant UI elements. An attacker who serves crafted web content can cause the browser to display misleading information about the origin, identity, or trust state of a page. Users may believe they are interacting with a legitimate site when the underlying content is attacker-controlled.

The issue is classified as a User Interface (UI) misrepresentation weakness rather than a memory safety or code execution flaw. Impact is limited to confidentiality and integrity of user-provided data. The scope is unchanged, meaning the vulnerable component and impacted component share the same security authority.

Root Cause

The root cause is improper communication of security state to the user, mapped to CWE-356. Edge for iOS does not sufficiently warn users when displayed content diverges from the actual origin. This behavior enables spoofing of address bars, dialogs, or other trust indicators specific to the mobile browser interface.

Attack Vector

Exploitation occurs over the network and requires user interaction. A typical attack chain involves an adversary hosting a malicious page or sending a crafted link through email, SMS, or messaging apps. When the target opens the link in Microsoft Edge for iOS, the browser renders content that impersonates trusted interface elements. Attackers commonly pair such flaws with phishing pages to harvest credentials or session tokens. No authentication is required to trigger the condition.

No verified proof-of-concept code is publicly available for this vulnerability. See the Microsoft Security Advisory CVE-2024-30057 for vendor-supplied technical details.

Detection Methods for CVE-2024-30057

Indicators of Compromise

User reports of Microsoft Edge for iOS displaying inconsistent or misleading URL bar contents on specific pages
Outbound HTTPS requests from mobile devices to newly registered or low-reputation domains following link clicks
Credential submissions from mobile Edge sessions to domains that do not match the perceived brand or origin

Detection Strategies

Correlate mobile browser telemetry with threat intelligence feeds to identify traffic to known phishing infrastructure
Monitor identity providers for authentication anomalies originating from iOS devices shortly after suspicious link delivery
Inspect email and SMS security gateways for URLs targeting mobile users with Edge-specific lures

Monitoring Recommendations

Log and review mobile browser version data across the managed fleet to identify unpatched Microsoft Edge for iOS installations
Track user-reported phishing incidents involving mobile browsers and correlate with Edge for iOS usage
Alert on repeated failed authentication attempts following delivery of external links to iOS users

How to Mitigate CVE-2024-30057

Immediate Actions Required

Update Microsoft Edge for iOS to the latest version available in the Apple App Store
Push mobile application updates through your Mobile Device Management (MDM) platform to enforce patched builds
Educate users to verify domains manually before entering credentials on mobile browsers
Deploy phishing-resistant authentication such as FIDO2 or platform authenticators to reduce credential theft impact

Patch Information

Microsoft addressed CVE-2024-30057 in a security update for Microsoft Edge for iOS. Refer to the Microsoft Security Advisory CVE-2024-30057 for the specific fixed version and release notes. Apply the update through the Apple App Store or via managed application distribution.

Workarounds

Restrict use of Microsoft Edge for iOS on managed devices until the patched version is installed
Route mobile web traffic through a secure web gateway that blocks known phishing domains
Configure enterprise browser policies to enforce update channels and disable installation of outdated builds

bash

# Verify Microsoft Edge for iOS version via MDM inventory query
# Example: query installed app version through your MDM console
# Ensure the installed build matches or exceeds the fixed version listed in the MSRC advisory