🔘 Vulnerability(cybersecuritynews.com): Researcher Claims CrowdStrike Falcon 0-Day Privilege Escalation Vulnerability
✉ 03.09.2026 08:35:43 Abinaya
💻 A security researcher known as Nightmare-Eclipse, who also goes by the names Chaotic Eclipse and MSNightmare, has released a project that claims to take advantage of a security flaw in the CrowdStrike Falcon Sensor. This flaw allows for local privilege escalation, which means it could give unauthorized users higher access rights.
The project, named FalconFlank, alleges that the issue abuses CrowdStrike’s remediation workflow for malicious Microsoft Office macros on Windows systems.
According to the repository’s README, the claimed flaw affects devices where the “Microsoft Office file malicious macro removal” capability is enabled.
The researcher stated that the proof of concept worked against fully updated Windows 11 25H2 and Windows Server 2025 environments protected by CrowdStrike Falcon with Phase 3 Optimal Protection enabled.
The public repository was created recently and includes C source code, a Visual Studio solution, project files, headers, and a compiled x64 release directory.
CrowdStrike Falcon 0-Day Privilege Escalation
Its README describes the project as a “Crowdstrike Falcon 0day Privilege Escalation Vulnerability,” but the claim has not been independently verified.
CrowdStrike had not issued a public advisory, CVE identifier, patch notice, or confirmation for the alleged vulnerability at the time of writing. The researcher claims the technique abuses the security product’s handling of Office documents identified as containing malicious macros.
PoC Demonstrates Local Privilege Escalation to SYSTEM Access (source: MSNightmare)
In endpoint protection platforms, remediation features often operate with elevated permissions because they may need to quarantine, delete, modify, or restore files in protected locations.
A local attacker could obtain higher privileges if they can manipulate a remediation process to load an attacker-controlled file, follow a malicious path, or handle unsafe file metadata. The FalconFlank README suggests that CrowdStrike detections may already identify the released proof of concept.
It also claims that testing may require Falcon exclusions or changes to the payload’s DLL loading method. Those statements should be treated with caution: they are assertions by the researcher and do not establish that a vulnerability exists or that exploitation is reliable across customer environments.
If validated, a privilege escalation flaw in an endpoint security agent could have significant security implications. Falcon runs with extensive operating system privileges to monitor activity and prevent threats.
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https://cybersecuritynews.com/crowdstrike-falcon-0-day/
read it on CSN:
https://csn.net4me.net/cyber_security_27911.html
Cyber Security News
Researcher Claims CrowdStrike Falcon 0-Day Privilege Escalation Vulnerability
A security researcher known as Nightmare-Eclipse, who also goes by the names Chaotic Eclipse and MSNightmare, has released a project that claims to take advantage of a security flaw in the CrowdStrike Falcon Sensor.
September 3, 2026 5
