[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$ffi9CWQSicszvaM239uCYcOBd_EprBGc1g_S4sflX4Wk":3},{"lesson":4},{"id":5,"slug":6,"article_id":7,"title":8,"body":9,"prevention":10,"framework_refs":11,"status":22,"created_at":23,"published_at":24,"article":25,"tags":29,"podcasts":48},"4fb9df87-2654-45d7-83f3-9a821b4d2dbc","pre-auth-rce-in-papercut-actively-exploited-in-the-wild","874838dd-6cbd-44c6-b5c0-f3c068b3fb3a","Pre-Auth RCE in PaperCut Actively Exploited in the Wild","A critical unauthenticated remote code execution vulnerability in PaperCut NG and PaperCut MF is being actively exploited, allowing attackers to seize full control of print management servers without any credentials. The root cause lies in failure to promptly patch a known critical flaw in widely deployed enterprise software, compounding the risk by exposing the management interface directly to potential attackers. Print management software is often overlooked in vulnerability management programs despite its broad deployment and elevated system privileges. This incident highlights that any internet-facing or network-accessible service — even peripheral management tools — represents a significant attack surface if left unpatched.","**Immediate actions:**\n- Apply the vendor-released patch or upgrade PaperCut NG\u002FMF to the latest fixed version immediately.\n- Restrict network access to the PaperCut administration interface using firewall rules, allowing only trusted IP ranges.\n- Run an authenticated vulnerability scan across all systems to identify any additional unpatched PaperCut instances in your environment.\n\n**Long-term improvements:**\n- Integrate print management and other peripheral software into your formal vulnerability management and patch cadence program.\n- Establish an emergency patching SLA (e.g., 24–72 hours) for critical CVEs rated CVSS 9.0+ on internet-facing or network-accessible systems.\n- Maintain a continuously updated asset inventory that includes all enterprise software, including non-traditional attack surfaces like print servers.\n\n**Detection measures:**\n- Deploy endpoint detection and response (EDR) tooling on print servers to identify anomalous process execution or lateral movement attempts.\n- Enable and centrally aggregate logs from PaperCut servers into your SIEM to alert on unusual authentication attempts or configuration changes.\n- Subscribe to vendor security advisories and threat intelligence feeds to receive early warning of active 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 800-40 Rev. 4: Guide to Enterprise Patch Management","NIST SI-2: Flaw Remediation","NIST RA-5: Vulnerability Monitoring and Scanning","NIST SC-7: Boundary Protection","NIST IR-4: Incident Handling","ISO 27001 Annex A.12.6.1: Management of Technical Vulnerabilities","ITIL: Change and Release Management (Emergency Change Procedure)","published","2026-08-28T12:21:09.709347+00:00","2026-08-28T12:21:09.597+00:00",{"id":7,"url":26,"slug":27,"title":28},"https:\u002F\u002Fwww.itsecurityguru.org\u002F2026\u002F08\u002F28\u002Fhackers-actively-exploiting-pre-auth-rce-flaw-in-papercut-print-software\u002F?utm_source=rss&utm_medium=rss&utm_campaign=hackers-actively-exploiting-pre-auth-rce-flaw-in-papercut-print-software","hackers-actively-exploiting-pre-auth-rce-flaw-in-papercut-print-software-67c600","Hackers Actively Exploiting Pre-Auth RCE Flaw in PaperCut Print Software",[30,36,42],{"id":31,"name":32,"slug":33,"description":34,"color":35},"05757c8d-6b93-4194-b35d-7359e7d33b0e","Vulnerability Management","vulnerability-management","Missing scans, no risk prioritization","#fb923c",{"id":37,"name":38,"slug":39,"description":40,"color":41},"af7fce9e-1ce8-4156-93bc-09dcfbfdf29d","Patch Management","patch-management","Unpatched vulnerabilities, delayed updates","#ef4444",{"id":43,"name":44,"slug":45,"description":46,"color":47},"f43a7f30-5046-4b10-9dba-1a704139821e","Network Segmentation","network-segmentation","Lateral movement, flat networks, missing firewalls","#06b6d4",[]]