[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$foP-Q6uHaA9Ie11pR8dZnsW6XdYJpdIZ_PaMCsP12nmg":3},{"lesson":4},{"id":5,"slug":6,"article_id":7,"title":8,"body":9,"prevention":10,"framework_refs":11,"framework_notes":22,"status":23,"created_at":24,"published_at":25,"article":26,"tags":30,"podcasts":49,"controls":56},"783782a2-740e-4330-9c8e-1b8bfad57ca6","weak-cryptographic-key-in-rejetto-hfs-enables-rce-via-session-forgery","a85619b9-6f44-4fbd-8b47-b23127d5f110","Weak Cryptographic Key in Rejetto HFS Enables RCE via Session Forgery","The core failure here is the use of a non-cryptographic random number generator to derive a signing key, making session tokens predictable and forgeable by attackers. This design flaw allows threat actors to reconstruct the signing key, impersonate administrators, and achieve full remote code execution — all without needing stolen credentials. Active scanning activity means exposed servers are being targeted right now, increasing the urgency for immediate remediation. The risk extends beyond the server itself: successful exploitation can lead to lateral movement, malware deployment, and mass data theft across connected systems.","**Immediate actions:**\n- Patch or upgrade all Rejetto HFS instances to the vendor-released fixed version that uses a cryptographically secure key generator.\n- Take internet-facing HFS servers offline or block external access via firewall rules until patching is confirmed complete.\n- Audit active sessions and invalidate all existing session tokens to eliminate any already-forged sessions.\n\n**Long-term improvements:**\n- Maintain a continuously updated inventory of all internet-facing services and map them to known CVEs using automated asset management tooling.\n- Enforce a policy requiring cryptographically secure random number generators (CSPRNG) in all software handling authentication tokens or signing keys.\n- Implement network segmentation to isolate file-sharing servers so that a compromised host cannot serve as a pivot point for lateral movement.\n\n**Detection measures:**\n- Deploy IDS\u002FIPS signatures or WAF rules to detect scanning and exploitation attempts targeting CVE-2026-61500.\n- Enable detailed access and authentication logging on HFS servers and alert on anomalous administrative logins or unexpected file operations.\n- Integrate threat intelligence feeds into your SIEM to receive real-time indicators of compromise associated with active HFS exploitation campaigns.",[12,13,14,15,16,17,18,19,20,21],"CIS Control 7: Continuous Vulnerability Management","CIS Control 12: Network Infrastructure Management","CIS Control 13: Network Monitoring and Defense","NIST SP 800-53 SI-2: Flaw Remediation","NIST SP 800-53 SC-13: Cryptographic Protection","NIST SP 800-53 AC-17: Remote Access","NIST SP 800-53 SC-7: Boundary Protection","NIST CSF ID.RA-1: Asset Vulnerabilities Identified","OWASP Cryptographic Failures (Top 10 A02:2021)","GDPR Article 32: Security of Processing (for servers storing personal data)",{},"published","2026-10-05T22:20:37.610367+00:00","2026-10-05T22:20:37.234+00:00",{"id":7,"url":27,"slug":28,"title":29},"https:\u002F\u002Fwww.bleepingcomputer.com\u002Fnews\u002Fsecurity\u002Frejetto-hfs-servers-now-actively-scanned-for-critical-rce-flaw\u002F","rejetto-hfs-servers-now-actively-scanned-for-critical-rce-flaw-243a0e","Rejetto HFS servers now actively scanned for critical RCE flaw",[31,37,43],{"id":32,"name":33,"slug":34,"description":35,"color":36},"05757c8d-6b93-4194-b35d-7359e7d33b0e","Vulnerability Management","vulnerability-management","Missing scans, no risk prioritization","#fb923c",{"id":38,"name":39,"slug":40,"description":41,"color":42},"859cf0ad-a7e9-42bb-a75d-bac6511fa5d5","Configuration Management","configuration-management","Misconfigs, default credentials, exposed services","#eab308",{"id":44,"name":45,"slug":46,"description":47,"color":48},"af7fce9e-1ce8-4156-93bc-09dcfbfdf29d","Patch Management","patch-management","Unpatched vulnerabilities, delayed updates","#ef4444",[50],{"id":51,"date":52,"edition":53,"title":54,"audio_url":55},"c5bfc0c6-1570-4f1f-b3ed-066c228bfb0f","2026-10-06","morning","ThreatNoir Morning Brief — October 6","https:\u002F\u002Fcdn.threatnoir.com\u002Fpodcasts\u002F2026-10-06\u002Fthreatnoir-morning-brief-2026-10-06.mp3",[57,60,63],{"slug":34,"name":58,"problem":59},"Vulnerability scanning and prioritisation","You know which systems are vulnerable, and which ones to fix first.",{"slug":46,"name":61,"problem":62},"Automated patch management","Known holes get closed in days, not months.",{"slug":64,"name":65,"problem":66},"threat-intelligence","Threat intelligence","Attack campaigns reach your sector, suppliers or software before your team hears about them."]