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Urgent Warning! Critical Rejetto HFS Vulnerability Discovered by AI Under Active Attack! Risk of Server Takeover 😱
Urgent Security Alert! Critical vulnerability CVE-2026-61500 in Rejetto HFS, discovered by AI, is actively being exploited by hackers. This poses a risk of privilege escalation to Admin and remote code execution (RCE) for server takeover. Immediate update is recommended.
📌 Key Takeaways:
- Widespread exploitation of vulnerability CVE-2026-61500 in Rejetto HTTP File Server (HFS) has been observed.
- This vulnerability allows attackers to steal the Session-Cookie signing key to forge Admin privileges and take control of the system.
- Successful attacks can lead to Remote Code Execution (RCE), enabling attackers to completely seize control of the server.
Urgent reports indicate that a critical security vulnerability in Rejetto HTTP File Server (HFS), a popular open-source file server program for Windows, is now being widely exploited by malicious actors. The vulnerability, tracked under CVE-2026-61500 (as stated in the source), directly impacts the security of data and the stability of servers in use.
⚙️ Attack Mechanism
The core of this vulnerability lies in an error that allows attackers to decrypt and recover the 'session-cookie signing key', a secret key used by the server to verify and authenticate the legitimacy of all user sessions. Once hackers obtain this key, it's akin to possessing a master key to the entire building.
💣 Severe Impact
Once attackers acquire the secret key, they can craft their own session cookies and successfully impersonate an Administrator. From that point, the door to complete server control opens. Attackers can access all files, modify settings, and, most dangerously, execute remote code (Remote Code Execution or RCE) to install malware, steal data, or use the server as a base for further attacks on other targets.
🤖 Noteworthy Point: AI Discovery
What makes this vulnerability stand out is that it was first discovered using an Artificial Intelligence (AI)-driven security tool. This highlights a new trend in the cybersecurity industry where AI is playing an increasingly crucial role in detecting complex vulnerabilities that might otherwise evade human inspection. For all administrators using Rejetto HFS, it is strongly recommended to check and update the software to the latest version as quickly as possible to mitigate this risk.
💬 Does your organization use AI to assist with system security checks? Share your experiences with us!