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CVE-2026-81578

PaperCut NG/MF Missing Authentication for Critical Function Vulnerability

PaperCut NG/MF CWE-305

An improper access control vulnerability exists in the web management interface of PaperCut MF and PaperCut NG. Under specific conditions, unauthenticated remote requests targeting administrative functions can trigger backend actions prior to the completion of access validation checks. This allows an unauthenticated remote attacker to modify certain system configurations.

CVSS Score
8.8
High
EPSS — Exploit Probability
86%
Riskier than 100% of all CVEs · checked 2026-10-12
Exploitation
Confirmed in the wild
KEV since 2026-08-31
Remediation
Patch available
Federal deadline 2026-09-14
CISA required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. Deadline for federal agencies: 2026-09-14.

NVD entry Vendor patch PoC / advisory CISA KEV

22 articles across 7 outlets · first covered Aug 28, 2026 · latest Oct 5, 2026

Coverage timeline

Related CVEs — PaperCut

CVE-2026-82078KEV CVE-2023-27351KEV