PaperCut Zero-Day Exploited in Attacks, Affecting All NG and MF Versions
PaperCut has alerted customers that bad actors are actively exploiting a vulnerability impacting all versions of its PaperCut NG and PaperCut MF print management software in zero-day attacks. The company has released an emergency patch for v25 and v26 to address the issue. It said it's "aware of confirmed customer incidents and is treating this matter with the highest priority." An investigation into the incident is ongoing. The following indicators of compromise have been shared so far - Alerts from intrusion-detection, endpoint-security, or network-monitoring tools involving the PaperCut Application Server, particularly suspicious post-exploitation activity from "pc-app.exe" Missing, unexpectedly truncated, or deleted PaperCut server.log files The presence of the below entries in "server.log" - ERROR No suitable driver found for jdbc:no:x ERROR DatabaseUtils - Database error looking up cardID: VALUES CAST ...
Aug 28, 2026