CVE-2024-30055: Microsoft Edge Chromium Spoofing Vulnerability

CVE-2024-30055 Overview

CVE-2024-30055 is a spoofing vulnerability in Microsoft Edge (Chromium-based) that enables attackers to misrepresent user interface elements to victims. The flaw is categorized under [CWE-451] (User Interface Misrepresentation of Critical Information), meaning the browser can display security-relevant information in a way that misleads users. Exploitation requires user interaction, typically by convincing a target to visit a crafted web page. Successful attacks can degrade the integrity and confidentiality of information presented in the browser, aiding phishing and credential-harvesting campaigns.

Critical Impact
Attackers can spoof trusted UI elements in Microsoft Edge to trick users into disclosing credentials or trusting malicious content over the network.

Affected Products

Microsoft Edge (Chromium-based)
Edge versions prior to the May 2024 security update
Windows, macOS, and Linux installations of Microsoft Edge Chromium

Discovery Timeline

2024-05-14 - CVE-2024-30055 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-30055

Vulnerability Analysis

CVE-2024-30055 is a spoofing weakness in Microsoft Edge (Chromium-based) tracked under [CWE-451]. The class of bug allows an attacker-controlled web page to present security-relevant UI in a misleading way. Users may perceive attacker-controlled content as originating from a trusted source. The impact focuses on the confidentiality and integrity of information shown to the user rather than direct code execution. Availability of the browser is not affected.

Root Cause

The vulnerability stems from improper representation of critical browser UI elements. Edge fails to consistently distinguish between trusted browser chrome and attacker-controlled page content in certain rendering scenarios. This mismatch enables an adversary to overlay, imitate, or obscure indicators such as URLs, dialogs, or origin markers. Microsoft has not published low-level implementation details for this issue in its public advisory.

Attack Vector

Exploitation occurs over the network and requires user interaction. An attacker hosts a crafted page and lures the victim to visit it through phishing, malvertising, or a compromised site. When the page loads in a vulnerable Edge build, the attacker controls or obscures UI elements the user relies on for trust decisions. The victim may then enter credentials, approve requests, or trust downloaded content that appears legitimate. No privileges are required on the target system.

No public proof-of-concept or exploit code is available for CVE-2024-30055. Microsoft has not published technical exploitation details. Refer to the Microsoft Security Update Guide CVE-2024-30055 for vendor guidance.

Detection Methods for CVE-2024-30055

Indicators of Compromise

Outbound browser connections to newly registered or typo-squatted domains that mimic known brands.
User reports of Edge address bar or dialog behavior that appears inconsistent with the visited site.
Credential submissions to URLs that diverge from the domain displayed in the browser UI.

Detection Strategies

Monitor Microsoft Edge process telemetry for navigation events to domains flagged by phishing or brand-protection feeds.
Correlate DNS resolution logs with proxy or SWG data to identify sessions where perceived and actual origin differ.
Track Edge browser version telemetry across the fleet and alert on hosts running builds released before the May 2024 patch.

Monitoring Recommendations

Ingest browser, proxy, and endpoint logs into a centralized analytics platform to correlate suspicious navigation with user actions.
Enable phishing and spoofing detections in Microsoft Defender SmartScreen and equivalent web protection tools.
Alert on Edge version drift so unpatched endpoints surface quickly during patch cycles.

How to Mitigate CVE-2024-30055

Immediate Actions Required

Update Microsoft Edge (Chromium-based) to the version listed in the Microsoft Security Update Guide CVE-2024-30055.
Verify that automatic Edge updates are enabled through group policy or Intune configuration profiles.
Confirm patch deployment on managed endpoints by inspecting edge://settings/help or centralized version telemetry.

Patch Information

Microsoft addressed CVE-2024-30055 through its May 2024 Edge security update. Administrators should install the fixed version identified in the Microsoft Security Update Guide CVE-2024-30055. Restart the browser after installation to ensure the patched binaries are loaded.

Workarounds

Enforce web filtering policies that block access to newly registered domains and known phishing infrastructure.
Deliver user awareness reminders to verify URLs directly and avoid entering credentials from links in unsolicited email.
Restrict use of unpatched Edge builds through conditional access policies that require compliant browser versions.

bash

# Configuration example: verify Edge version on Windows endpoints
reg query "HKLM\SOFTWARE\Microsoft\Edge\BLBeacon" /v version

# Force update check via Edge command line
start msedge://settings/help