PaperCut Zero-Day Exploits Force Double Emergency Patches for Critical RCE Flaws
In August 2026, PaperCut released emergency patches for two actively exploited zero-day vulnerabilities (CVE-2026-82078 and CVE-2026-81578) affecting PaperCut NG and MF print management software. The vulnerabilities allowed unauthenticated attackers to bypass authentication and achieve remote code execution on vulnerable servers. After security researchers discovered multiple bypass techniques for the initial patches, PaperCut was forced to release a second emergency patch with additional hardening measures. The attacks appear to be limited and targeted, with threat actors conducting system reconnaissance on compromised servers. This incident highlights the persistent threat to network-accessible management interfaces and the growing sophistication of attackers who can quickly develop bypass techniques for security patches. It underscores the critical importance of implementing zero-trust network segmentation and egress controls to limit the impact of successful initial compromises.
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