PaperCut MF/NG: Authentication Bypass

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-81578
StatePUBLISHED
AssignerPaperCut
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 16:18:29 UTC
Updated2026-08-28 20:20:11 UTC
DescriptionAn 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.

Risk And Classification

Primary CVSS: v4.0 8.8 HIGH from eb41dac7-0af8-4f84-9f6d-0272772514f4

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

Problem Types: CWE-305 | CWE-305 CWE-305 Authentication bypass by primary weakness

VersionSourceTypeScoreSeverityVector
4.0eb41dac7-0af8-4f84-9f6d-0272772514f4Secondary8.8HIGHCVSS: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/C...
4.0CNACVSS8.8HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
Low
Integrity
High
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA PaperCut PaperCut MF/NG affected 24.1.10, 25.0.13, 26.0.5 semver Not specified

References

ReferenceSourceLinkTags
www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory eb41dac7-0af8-4f84-9f6d-0272772514f4 www.papercut.com
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