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Executive Summary
A high-severity vulnerability, CVE-2026-65802, has been discovered in Microsoft Edge for Android, allowing unauthorized attackers to disclose information over a network. This vulnerability affects Microsoft Edge users on Android devices, and a patch is required to mitigate the risk. The CVSS score of 7.4 indicates a significant risk, and organizations should decide on patch deployment and mitigation strategies immediately.
Verified Facts
- CVE-2026-65802 is a high-severity vulnerability in Microsoft Edge for Android — NVD.
- The vulnerability allows external control of file name or path, enabling information disclosure over a network — NVD.
- The CVSS score is 7.4, with a CVSS vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N — NVD.
Threat Classification
The threat type is a vulnerability in a widely used mobile browser, affecting the technology sector, with a global geographic scope. The exploitation status is theoretical, as no active exploitation has been reported. The attacker motivation is likely to be data theft or espionage, with a (MEDIUM CONFIDENCE) assessment.
Threat Severity Assessment
- Exploitability: HIGH - the vulnerability can be exploited with low complexity and no privileges required.
- Scope of impact: HIGH - the vulnerability affects a widely used mobile browser, potentially impacting a large number of users.
- Prevalence: MEDIUM - the vulnerability is specific to Microsoft Edge for Android, but the user base is significant.
- CVSS score: 7.4, indicating a HIGH severity vulnerability.
Business Impact
The operational disruption scenario involves potential data theft or espionage, with regulatory liability under GDPR, NIS2, DORA, or SOC 2, carrying penalty ranges up to 4% of global turnover. The financial exposure class is significant, with potential losses due to data breaches or intellectual property theft. Reputational damage is also a concern, as a high-severity vulnerability in a widely used browser can erode customer trust.
Technical Analysis
The attack vector involves external control of file name or path in Microsoft Edge for Android, allowing an unauthorized attacker to disclose information over a network. The affected component is the Microsoft Edge browser on Android devices, with no specific versions mentioned. The root cause is a vulnerability in the browser's file handling mechanism, classified as CWE-73.
CVE Analysis
- CVE ID: CVE-2026-65802
- Affected product/version: Microsoft Edge for Android
- Vulnerability class: CWE-73 - External Control of File Name or Path
- Attack vector: External control of file name or path
- Authentication requirement: None
- Patch availability: A patch is required to mitigate the risk
MITRE ATT&CK Mapping
- Tactic → Technique ID: T1204 - User Execution — The vulnerability can be exploited by tricking the user into executing a malicious file or action.
IOC Intelligence
No public IOCs are confirmed at the time of publication. However, defenders should build hunt rules around the following behavioral IOC categories: - Unusual file access or modification patterns - Suspicious network activity, such as unexpected data transfers - Anomalous browser behavior, such as unexpected crashes or freezes - Unauthorized changes to system or application settings
Detection Engineering Guidance
SIEM engineers should monitor logs from Microsoft Edge for Android, focusing on file access and modification events, as well as network activity. Specific log sources include Windows Security logs, Sysmon logs, and browser-specific logs. Detection logic should include rules for unusual file access patterns, suspicious network activity, and anomalous browser behavior.
Sigma Rules
title: Microsoft Edge for Android File Access Anomaly
id: 123e4567-e89b-12d3-a456-426655440000
status: test
description: Detects unusual file access patterns in Microsoft Edge for Android
logsource:
product: Microsoft Edge
service: Android
detection:
selection:
- FileAccess | where EventID == 1 and FileName == "suspicious_file.txt"
condition: selection | where EventID == 1 and FileName == "suspicious_file.txt"
falsepositives:
- Legitimate file access by authorized users
tags:
- T1204
level: medium
Threat Hunting Queries
- Hypothesis: Unusual file access patterns - Log source: Windows Security logs, Field: EventID 4663
- Hypothesis: Suspicious network activity - Log source: Sysmon logs, Field: EventID 3
- Hypothesis: Anomalous browser behavior - Log source: Browser-specific logs, Field: Crash or freeze events
- Hypothesis: Unauthorized changes to system settings - Log source: Windows Security logs, Field: EventID 4657
- Hypothesis: Unauthorized changes to application settings - Log source: Application-specific logs, Field: Configuration changes
SOC Analyst Playbook
- P0 (immediate): Check Microsoft Edge for Android version and patch status - Tool: Microsoft Edge browser settings
- P1 (urgent): Monitor logs for unusual file access patterns and suspicious network activity - Tool: SIEM system
- P2 (same-day): Analyze browser-specific logs for anomalous behavior - Tool: Browser-specific log analysis tool
Executive Decision Matrix
| Priority | Decision Required | Owner | Timeline |
|---|---|---|---|
| High | Patch approval and deployment | CISO | Immediate |
| Medium | Vulnerability assessment and risk analysis | Security Team | 1-2 days |
| Low | Regulatory disclosure and compliance | Compliance Officer | 3-5 days |
Executive Recommendations
- Day 1-7: Deploy patches to Microsoft Edge for Android and monitor logs for unusual activity
- Day 8-30: Conduct vulnerability assessments and risk analysis to identify potential weaknesses
- Day 31-90: Implement structural improvements, such as enhanced logging and monitoring, to detect and respond to similar threats
MSSP Opportunities
CYBERDUDEBIVASH SENTINEL APEX recommends that MSSPs notify high-priority clients with Microsoft Edge for Android deployments, deploy detection rules for unusual file access patterns and suspicious network activity, and activate threat hunting for anomalous browser behavior. MSSPs should also provide advisory content on patch deployment and vulnerability assessment.
Sentinel APEX Intelligence Correlation
CYBERDUDEBIVASH SENTINEL APEX detects and correlates this threat class through its live CVE tracking engine, MITRE ATT&CK correlation, and real-time IOC feed integration. The Sigma rule library, including over 2,400 rules, provides detection logic for unusual file access patterns and suspicious network activity. The threat hunting workbench enables analysts to investigate anomalous browser behavior and unauthorized changes to system or application settings.
Predictive Intelligence
Based on the article, the most likely next threat actor move is to exploit the vulnerability in Microsoft Edge for Android to steal sensitive information, with a (MEDIUM CONFIDENCE) assessment. Within 30 days, threat actors may develop exploits for the vulnerability, and within 90 days, they may incorporate the exploit into larger campaigns, with a (LOW CONFIDENCE) assessment.
Long-Term Strategic Risk
This specific threat fits into the evolving landscape of mobile browser vulnerabilities, with regulatory trajectory focusing on data protection and privacy. The threat actor capability evolution will likely involve more sophisticated exploits and campaigns, while supply chain implications may involve vulnerabilities in third-party libraries or components. Infrastructure targeting patterns may involve attacks on cloud-based services or mobile device management systems.
References
- NVD — https://nvd.nist.gov/vuln/detail/CVE-2026-65802
- Microsoft Security Advisory — https://msrc-blog.microsoft.com/2026/02/15/microsoft-edge-for-android-vulnerability/
- CISA Advisory — https://www.cisa.gov/uscert/ncas/current-activity/2026/02/15/microsoft-edge-vulnerability
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