Risk Letters

Exploited vulnerability

CVE-2026-81578

TLP:CLEAR

PaperCut NG/MF Missing Authentication for Critical Function Vulnerability

PaperCut NG/MF contains a missing authentication for critical function vulnerability which allows an unauthenticated remote attacker to modify certain system configurations. This vulnerability can be chained with CVE-2026-82078.

Facts

  • Vendor: PaperCut
  • Product: NG/MF
  • CVSS: 8.8
  • EPSS (probability of exploitation within 30 days): 84.7 %
  • On CISA's Known Exploited Vulnerabilities list since: 31 August 2026
  • First known exploitation: 31 August 2026
  • CISA's deadline for US federal agencies: 14 September 2026
  • Weakness: CWE-306
  • First seen by Risk Letters: 31 August 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD