CVE-2025-49741: Microsoft Edge Information Disclosure Flaw

CVE-2025-49741 Overview

CVE-2025-49741 is an information disclosure vulnerability affecting Microsoft Edge (Chromium-based) that allows an unauthorized attacker to disclose sensitive information over a network. This vulnerability stems from improper privilege comparison (CWE-268) and information exposure issues (CWE-200), enabling remote attackers to access confidential data without authentication.

Critical Impact

This vulnerability enables unauthorized network-based attackers to access sensitive information from affected Microsoft Edge installations without requiring user interaction or special privileges.

Affected Products

• Microsoft Edge (Chromium-based) - All versions prior to patch
• Windows systems running vulnerable Microsoft Edge Chromium versions
• Enterprise environments with Microsoft Edge deployed across workstations

Discovery Timeline

• 2025-07-01 - CVE-2025-49741 published to NVD
• 2025-07-08 - Last updated in NVD database

Technical Details for CVE-2025-49741

Vulnerability Analysis

This information disclosure vulnerability in Microsoft Edge (Chromium-based) allows remote attackers to extract sensitive data from affected browser installations. The vulnerability is categorized under CWE-268 (Privilege Defined With Unsafe Actions) and CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), indicating that the flaw involves both improper privilege handling and unintended information exposure.

The attack can be executed remotely over a network without requiring authentication or user interaction, making it particularly dangerous in enterprise environments where Microsoft Edge is widely deployed. Successful exploitation results in unauthorized access to confidential information, potentially including user credentials, session tokens, browsing data, or other sensitive content processed by the browser.

Root Cause

The vulnerability originates from improper privilege comparison mechanisms within Microsoft Edge's Chromium-based architecture. The browser fails to properly enforce access controls when handling certain network requests, allowing unauthorized actors to bypass security boundaries and access protected information. The combination of CWE-268 and CWE-200 weaknesses suggests that privilege escalation paths exist that can be leveraged to expose sensitive data that should otherwise be protected.

Attack Vector

The attack is network-based and can be exploited remotely. An attacker does not need any prior privileges or authentication to exploit this vulnerability, nor is user interaction required. The attack targets the confidentiality of data processed by the browser, with the potential to expose sensitive information to unauthorized parties.

The exploitation scenario typically involves an attacker sending specially crafted network requests to trigger the information disclosure condition. Given that exploit database entries are available for this vulnerability, security teams should treat this as a high-priority threat requiring immediate attention.

The vulnerability allows attackers to craft malicious requests that exploit the privilege comparison flaw in Microsoft Edge's request handling mechanisms. When successful, these requests can extract sensitive information that should be protected by the browser's security model. The technical details of the exploitation mechanism are available through the Microsoft Security Response Center advisory.

Detection Methods for CVE-2025-49741

Indicators of Compromise

• Unusual outbound network traffic patterns from Microsoft Edge processes to unknown external destinations
• Anomalous data exfiltration patterns in network logs correlating with Edge browser activity
• Unexpected information disclosure events logged in browser security telemetry
• Evidence of unauthorized access to browser-stored credentials or session data

Detection Strategies

• Deploy network monitoring rules to identify exploitation attempts targeting Microsoft Edge browser sessions
• Implement endpoint detection to monitor for anomalous Microsoft Edge process behavior and network communications
• Enable browser security logging and correlate events with network traffic analysis for comprehensive threat visibility
• Utilize SentinelOne Singularity platform to detect and respond to exploitation attempts in real-time

Monitoring Recommendations

• Monitor Microsoft Edge version deployment across the enterprise to ensure all instances are patched
• Implement network segmentation and traffic analysis to detect potential data exfiltration attempts
• Enable detailed logging on web proxy servers to capture suspicious browser traffic patterns
• Review Microsoft Security Response Center updates for additional IOCs and detection guidance

How to Mitigate CVE-2025-49741

Immediate Actions Required

• Update Microsoft Edge (Chromium-based) to the latest patched version immediately across all enterprise systems
• Review network logs for evidence of exploitation attempts or successful information disclosure events
• Implement network-level controls to restrict unauthorized access to sensitive browser communications
• Deploy SentinelOne endpoint protection to detect and block exploitation attempts

Patch Information

Microsoft has released a security update addressing CVE-2025-49741. Organizations should apply the latest Microsoft Edge update through their standard patch management processes. The official security advisory and patch information is available from the Microsoft Security Response Center.

Enterprise administrators should prioritize this update given the network-based attack vector and the availability of exploit information. Automatic updates should be verified across all managed endpoints, and manual deployment may be required for systems with update restrictions.

Workarounds

• Restrict Microsoft Edge usage to trusted network environments until patches can be applied
• Implement network-level access controls to limit exposure of vulnerable browser instances
• Consider using alternative browsers for sensitive operations until the patch is deployed
• Enable enhanced browser isolation features where available to limit potential information exposure

Organizations without immediate patching capability should implement compensating controls including enhanced network monitoring, web filtering policies, and user awareness training about potential exploitation scenarios.