Vuln: CVE-2026-20841 | Detection.FYI

Potential Notepad Markdown RCE Exploitation

Sep 19, 2026 · Domain: Endpoint OS: Windows Use Case: Threat Detection Tactic: Execution Data Source: Elastic Endgame Data Source: Elastic Defend Data Source: Microsoft Defender XDR Data Source: Sysmon Data Source: SentinelOne Resources: Investigation Guide Noise: Low Performance: Normal Profile: Recommended Threat: Vulnerability Exploit Rule Type: Event Correlation (EQL) Platform: Windows Vuln: CVE-2026-20841 ·
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Identifies a process started by Notepad after opening a Markdown file. This may indicate successful exploitation of a Notepad markdown parsing vulnerability (CVE-2026-20841) that can lead to arbitrary code execution.

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