CVE-2025-29825 Overview
CVE-2025-29825 is a user interface spoofing vulnerability in Microsoft Edge (Chromium-based). The flaw stems from misrepresentation of critical information in the browser UI, allowing an unauthorized attacker to conduct spoofing attacks over a network. The vulnerability is classified under [CWE-451: User Interface (UI) Misrepresentation of Critical Information].
Exploitation requires user interaction, such as clicking a crafted link or visiting an attacker-controlled page. Successful exploitation can mislead users into trusting spoofed content or origin indicators, enabling downstream phishing and credential theft attacks.
Critical Impact
Attackers can misrepresent security-relevant UI elements in Microsoft Edge, deceiving users into trusting malicious network content and enabling credential theft or malware delivery through phishing workflows.
Affected Products
- Microsoft Edge (Chromium-based) — all versions prior to the patched release
- Windows platforms running vulnerable Edge builds
- macOS and Linux platforms running vulnerable Edge builds
Discovery Timeline
- 2025-05-02 - CVE-2025-29825 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-29825
Vulnerability Analysis
The vulnerability resides in how Microsoft Edge (Chromium-based) renders critical UI elements that convey trust and origin information. An attacker who controls a network-reachable resource can craft content that causes the browser to display misleading indicators. Users viewing the affected UI cannot reliably distinguish legitimate content from attacker-supplied content.
The attack requires user interaction, meaning the victim must navigate to or interact with attacker-controlled content. The scope remains unchanged, but confidentiality impact is high because spoofed UI can lead users to disclose sensitive information such as passwords, session tokens, or financial details.
This class of flaw is particularly effective in phishing campaigns. Attackers combine UI spoofing with lookalike domains or hijacked ad networks to increase perceived legitimacy of malicious pages.
Root Cause
The root cause is improper handling and rendering of critical UI information within Edge. The browser presents security-relevant indicators in a manner that an attacker can manipulate through crafted web content, violating the security assumption that UI chrome accurately reflects the origin and trust state of loaded resources.
Attack Vector
Exploitation occurs over the network. An attacker hosts crafted content on a webpage, delivers it through a compromised site, or embeds it within an advertisement. The victim must interact with the content, typically by visiting the URL. Once loaded, the attacker manipulates browser UI elements to disguise the true origin or intent of the page, enabling social engineering.
Refer to the Microsoft Security Update CVE-2025-29825 advisory for vendor-provided technical details.
Detection Methods for CVE-2025-29825
Indicators of Compromise
- Browser telemetry showing navigation to newly registered or low-reputation domains followed by credential submission events.
- Endpoint logs indicating Microsoft Edge processes loading content from URLs flagged by threat intelligence feeds for phishing.
- User-reported incidents of unexpected authentication prompts or address bar inconsistencies within Edge sessions.
Detection Strategies
- Monitor for outbound HTTP/HTTPS connections from msedge.exe to domains matching phishing patterns or typosquatting indicators.
- Correlate browser process activity with credential-related events such as password manager autofill triggers on suspicious pages.
- Deploy web proxy inspection with URL categorization to identify traffic to known spoofing infrastructure.
Monitoring Recommendations
- Enable and centralize Microsoft Edge enterprise telemetry through Microsoft Defender for Endpoint or comparable EDR platforms.
- Track Edge version inventory across the fleet to identify unpatched hosts running vulnerable builds.
- Alert on user reports of UI inconsistencies and correlate them with recent browsing history for rapid triage.
How to Mitigate CVE-2025-29825
Immediate Actions Required
- Update Microsoft Edge to the latest stable channel version as published in the Microsoft Security Update CVE-2025-29825 advisory.
- Enforce automatic browser updates through group policy or Microsoft Intune to prevent version drift.
- Verify the running Edge version on managed endpoints using edge://settings/help or centralized inventory tooling.
Patch Information
Microsoft has released a security update for Microsoft Edge (Chromium-based) addressing this vulnerability. Administrators should consult the Microsoft Security Update CVE-2025-29825 advisory for the specific fixed version and deploy the update through standard patch management processes.
Workarounds
- Deliver user awareness training focused on verifying URLs and TLS certificates before entering credentials.
- Restrict browsing to categorized destinations using web filtering to reduce exposure to attacker-controlled content.
- Deploy phishing-resistant authentication such as FIDO2 security keys so that spoofed UI cannot yield reusable credentials.
# Verify Microsoft Edge version on Windows endpoints
reg query "HKLM\SOFTWARE\Microsoft\Edge\BLBeacon" /v version
# Force Edge update check via command line
"%ProgramFiles(x86)%\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ua /installsource scheduler
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
