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Unpatched PaperCut NG/MF vulnerability is under active attack

Feeds2.Feedburner •Zeljka Zorz • August 27, 2026

A yet unspecified vulnerability affecting print management solutions PaperCut NG and PaperCut MF is being exploited by attackers, PaperCut Software warned today. “We are aware of confirmed customer incidents and are treating this matter with the highest priority,” the vendor said. What is PaperCut NG/MF? PaperCut NG is print management software for places like offices, schools, and other organizations. PaperCut MF (“Multi-Function”) is the upgraded version that works directly with the big all-in-one office copier … More →

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

PaperCut NG/MF Vulnerability Under Active Exploitation On August 27, 2026, PaperCut issued an urgent advisory regarding a zero-day vulnerability affecting its NG and MF print management software. This flaw allows unauthenticated attackers to execute arbitrary Java code remotely, compromising server configurations. Emergency patches have been released for versions 25 and 26, while version 24 patches are still pending. Organizations are advised to restrict public access to their PaperCut servers immediately. Reports indicate limited exploitation in the wild, with two confirmed incidents noted by Huntress. The vulnerability is currently being actively exploited, and the PaperCut security team is investigating further incidents. Indicators of compromise include suspicious activity from the pc-app.exe process and unusual log file modifications. 51 sources 73

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PaperCut Software