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
Source: The Hacker News · August 28, 2026 at 10:01 AM · AI-assisted report
Single-sourceMALAYSIA, 28 AUGUST 2026 —
Malaysia Warned of Zero-Day Attacks on PaperCut Print Software
Market Impact
Malaysian businesses using PaperCut’s print management software are urged to act after the company disclosed a zero-day vulnerability being exploited in attacks targeting all versions of PaperCut NG and PaperCut MF. The Australian-based firm released emergency patches for versions 25 and 26, warning of “confirmed customer incidents” and urging immediate action to secure exposed servers.
The flaw’s technical details remain undisclosed, and no information is available on how the vulnerability is being exploited or the identities of the threat actors. PaperCut advised users with internet-facing Application Servers to restrict access to trusted IP addresses immediately, using firewall rules or network controls to block untrusted traffic. The company emphasized that these steps should be taken “even if no suspicious activity has been observed.”
This incident follows a 2023 breach where Russian-linked threat actors and the financially motivated group Lace Tempest exploited a critical PaperCut flaw (CVE-2023-27350, CVSS score: 9.8) to deploy Cl0p and LockBit ransomware. The current zero-day’s severity and potential for widespread impact remain unclear.
Details not yet available on whether Malaysian organizations have been affected. Users are advised to apply the emergency patch and review their network security measures promptly. Further updates will be provided as the investigation progresses.
Related: PaperCut · Malaysia