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Tool Directory

CVE-2026-81578

HighPublished

PaperCut MF/NG: Authentication Bypass

Published: Aug 28, 2026
Updated: Sep 1, 2026
Assigning CNA: PaperCut
Evidence observed: Aug 29, 2026

Primary CVSS

8.8/ 10High

nvd · CVSS 4.0

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

EPSS probability estimate

3.3%

Low · next 30 days

Percentile: 87.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

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.

Sources

PaperCut-CVE-2026-81578-82078Exploit
Security research tool for PaperCut CVE-2026-81578 & CVE-2026-82078

Responsible use

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