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CVE-2026-81578: PaperCut NG/MF Missing Authentication for Critical Function Vulnerability

PaperCut NG/MF · in CISA KEV since 2026-08-31

2026-08-31added to KEV

2026-09-14federal remediation due date

3.29%EPSS exploit probability (30 days) 88.0th percentile

8.8 HIGHCVSS 4.0

Unknownknown ransomware use

3days from NVD publication to KEV

What it is

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.

Required action (CISA)

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.

CWE	CWE-306
CVSS vector	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X`
NVD published	2026-08-28 (Analyzed)

Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2026-81578.json · all KEV CVEs

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