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Unknown PaperCut NG/MF vulnerability is under active attack

ID: 54d7d138-aa16-5922-9831-d7bae5dc393e

STIX ID: report--54d7d138-aa16-5922-9831-d7bae5dc393e

Feed Name: Help Net Security

Threat Score
80/100

Date Published: 2026-08-27

Date Updated: 2026-08-27

Author: Zeljka Zorz

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A currently exploited vulnerability in PaperCut NG/MF has led to confirmed customer incidents; PaperCut advises immediately restricting public access to Application Servers, monitoring for IOCs such as suspicious pc-app.exe activity, missing/truncated server.log files, and specific error messages, and has issued emergency patches after reproducing the issue with help from a customer forensic team.

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