CVE-2024-29981: Microsoft Edge Chromium Spoofing Vulnerability

CVE-2024-29981 Overview

CVE-2024-29981 is a spoofing vulnerability in Microsoft Edge (Chromium-based). The flaw is categorized under [CWE-1021] Improper Restriction of Rendered UI Layers or Frames. An attacker can craft a malicious web page that misleads users about the origin or context of displayed content. Exploitation requires user interaction, such as visiting an attacker-controlled URL. The issue affects the browser's handling of UI rendering rather than memory safety or code execution. Microsoft addressed the vulnerability through its regular Edge update channel.

Critical Impact
Successful exploitation allows an attacker to spoof browser UI elements, enabling phishing and social engineering attacks against Microsoft Edge users.

Affected Products

Microsoft Edge (Chromium-based) — versions prior to the fixed release
Microsoft Edge Stable Channel on Windows
Microsoft Edge Stable Channel on macOS

Discovery Timeline

2024-04-04 - CVE-2024-29981 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-29981

Vulnerability Analysis

CVE-2024-29981 is a spoofing vulnerability affecting Microsoft Edge (Chromium-based). The weakness maps to [CWE-1021], Improper Restriction of Rendered UI Layers or Frames. Attackers exploit the issue by luring a user into loading a specially crafted web page. The browser then presents UI elements or framed content in a way that misrepresents the true source of the content. This class of flaw undermines the user's ability to trust address bar indicators, frame boundaries, or security prompts.

The impact is limited to integrity of displayed content. There is no direct loss of confidentiality or availability, and no arbitrary code execution. However, spoofed UI is a common precursor to credential theft and downstream account compromise. The attack surface is network-reachable content, meaning any visited site could carry the payload.

Root Cause

The root cause resides in how Edge restricts and renders framed or overlaid UI layers. Insufficient enforcement of frame boundaries or origin indicators allows attacker-controlled content to appear as if it originates from a trusted context. Microsoft's advisory does not disclose the specific rendering component involved.

Attack Vector

Exploitation is performed over the network and requires user interaction. A victim must navigate to an attacker-controlled page or interact with malicious embedded content. No authentication or elevated privileges are required on the target system. See the Microsoft Security Response Center advisory for vendor-provided details.

No public proof-of-concept exploit is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2024-29981

Indicators of Compromise

Browser navigation events to newly registered or typosquatted domains that closely mimic legitimate brand assets.
User reports of unexpected authentication prompts or address bar content that does not match the intended site.
Outbound requests to credential-harvesting endpoints following an Edge browsing session.

Detection Strategies

Monitor Microsoft Edge version telemetry across the fleet and flag endpoints running unpatched builds.
Correlate web proxy logs with threat intelligence feeds to identify visits to phishing infrastructure that could weaponize UI spoofing.
Inspect email gateway logs for URLs directing users to pages that trigger Edge-specific spoofing behavior.

Monitoring Recommendations

Enforce browser update compliance reporting through Microsoft Intune or equivalent endpoint management tooling.
Track user-reported phishing submissions and correlate with Edge browsing history for the affected sessions.
Alert on anomalous credential submission patterns following redirects from external referrers.

How to Mitigate CVE-2024-29981

Immediate Actions Required

Update Microsoft Edge to the latest Stable Channel release using the vendor's automatic update mechanism.
Verify installed Edge versions on managed endpoints and remediate any lagging installations.
Reinforce user awareness on validating URLs and authentication prompts before submitting credentials.

Patch Information

Microsoft has issued a fix through the Edge Stable Channel. Refer to the Microsoft CVE-2024-29981 Update guidance for the specific patched version and release notes. Ensure Edge auto-update is enabled, or deploy the update through Microsoft Endpoint Manager, WSUS, or an equivalent distribution channel.

Workarounds

Restrict browsing to trusted sites using enterprise URL allow-listing until patches are deployed.
Deploy phishing-resistant authentication such as FIDO2 security keys to reduce impact of credential spoofing.
Enable Microsoft Defender SmartScreen to block known malicious and phishing sites in Edge.

bash

# Verify installed Microsoft Edge version (Windows)
(Get-Item "$Env:ProgramFiles (x86)\Microsoft\Edge\Application\msedge.exe").VersionInfo.ProductVersion

# Force policy-based auto-update via registry
reg add "HKLM\SOFTWARE\Policies\Microsoft\EdgeUpdate" /v UpdateDefault /t REG_DWORD /d 1 /f