Critical PaperCut Vulnerability Chain Enables Unauthenticated Remote Code Execution
In August 2026, threat actors actively exploited two chained vulnerabilities in PaperCut NG and MF print management software to achieve unauthenticated remote code execution. CVE-2026-81578 (CVSS 8.8) allows attackers to bypass authentication through improper access control, while CVE-2026-82078 (CVSS 9.4) enables unsafe dynamic class loading for arbitrary code execution. Huntress researchers observed limited exploitation targeting internet-facing instances, with attackers performing reconnaissance commands and deploying Java payloads to fingerprint systems and exfiltrate data before cleaning up evidence. This incident highlights the growing trend of vulnerability chaining attacks targeting enterprise infrastructure software, particularly as organizations increasingly rely on cloud-connected print management systems that often lack proper network segmentation and access controls.
Kill Chain