CVE-2025-25001 Overview
CVE-2025-25001 is a cross-site scripting (XSS) vulnerability in Microsoft Edge (Chromium-based) that allows an unauthenticated attacker to perform spoofing over a network. The flaw stems from improper neutralization of input during web page generation [CWE-79]. An attacker can craft malicious content that, when rendered by the browser, executes script in the context of a targeted page. Successful exploitation requires user interaction, such as clicking a crafted link. The vulnerability affects the iOS build of Microsoft Edge and impacts confidentiality without directly affecting integrity or availability.
Critical Impact
Attackers can leverage this XSS flaw to spoof web content and deceive users, potentially leading to credential theft or phishing under the guise of a trusted Edge browsing session.
Affected Products
- Microsoft Edge (Chromium-based) on iOS
- Configurations matching CPE cpe:2.3:a:microsoft:edge:*:*:*:*:*:iphone_os:*:*
- Users browsing untrusted or attacker-controlled web content
Discovery Timeline
- 2025-04-04 - CVE-2025-25001 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-25001
Vulnerability Analysis
The vulnerability is a cross-site scripting weakness classified under [CWE-79]. Microsoft Edge on iOS fails to properly neutralize user-controlled input during web page generation. When crafted input reaches a rendering context without adequate sanitization, the browser interprets attacker-supplied data as executable script or markup. This condition enables spoofing attacks where an adversary manipulates the displayed content to impersonate legitimate sites or UI elements. The attack vector is network-based, and exploitation requires the target user to interact with attacker-controlled content, typically by visiting a malicious URL. Impact is limited to confidentiality, with no direct effect on data integrity or service availability.
Root Cause
The root cause is improper output encoding or input sanitization within a code path that generates web page content in Microsoft Edge on iOS. Special characters used in HTML, JavaScript, or URL contexts are not neutralized before rendering, allowing injected payloads to execute or alter the visual presentation of the page.
Attack Vector
An attacker hosts or injects malicious content into a web page. When the victim opens the crafted page in Microsoft Edge on iOS, the unsanitized input triggers script execution or UI spoofing in the browser context. Delivery typically occurs via phishing links, malicious advertisements, or compromised legitimate sites. Since the attacker requires no privileges but needs user interaction, successful exploitation depends on social engineering.
No verified public proof-of-concept is available for CVE-2025-25001. Refer to the Microsoft Security Response Center advisory for vendor-provided technical context.
Detection Methods for CVE-2025-25001
Indicators of Compromise
- Outbound network requests from Edge on iOS to newly registered or low-reputation domains preceding credential prompts
- Web proxy logs showing HTTP responses containing unescaped <script> tags or event handlers reflected from user input
- User reports of unexpected content, credential prompts, or UI elements while browsing in Microsoft Edge on iOS
Detection Strategies
- Inspect web application logs for reflected input containing HTML or JavaScript syntax such as <script>, onerror=, or javascript: URIs
- Deploy browser telemetry and mobile threat defense to flag anomalous script execution or DOM manipulation in Edge on iOS
- Correlate phishing email delivery with subsequent Edge browsing sessions to attacker-controlled domains
Monitoring Recommendations
- Monitor mobile device management (MDM) inventory to confirm Edge on iOS versions are patched to the fixed release
- Track user-reported phishing attempts targeting mobile browsers and pivot on referenced URLs
- Enable enterprise browser telemetry ingestion into a centralized SIEM for cross-user correlation of suspicious page loads
How to Mitigate CVE-2025-25001
Immediate Actions Required
- Update Microsoft Edge on iOS to the latest version available through the Apple App Store
- Enforce automatic app updates via MDM policy for managed iOS devices
- Educate users to avoid clicking unsolicited links, particularly in email, SMS, and messaging apps
Patch Information
Microsoft has published guidance and update information in the Microsoft CVE-2025-25001 Update advisory. Apply the fixed version of Microsoft Edge for iOS as distributed through the Apple App Store.
Workarounds
- Restrict access to untrusted websites through mobile web filtering or secure web gateway policies
- Use MDM configuration profiles to enforce updated browser versions across the fleet
- Route mobile browsing traffic through corporate inspection points to identify reflected XSS payloads
# Example: enforce minimum Edge version via Microsoft Intune app configuration policy
# Assign the latest Microsoft Edge for iOS version as required in the App Protection Policy
# Then verify compliance:
# In Intune admin center -> Apps -> Monitor -> App install status
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
