PaperCut MF/NG: Unsafe Dynamic Class Loading in Database Connector

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Summary

CVECVE-2026-82078
StatePUBLISHED
AssignerPaperCut
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 16:18:31 UTC
Updated2026-08-28 20:20:14 UTC
DescriptionAn unsafe dynamic class loading vulnerability exists in the database connection utilities of PaperCut MF and PaperCut NG. The application instantiates database driver classes based on configurable driver names without validating against an allowlist of approved drivers. If an attacker can manipulate system configuration parameters, this enables the execution of arbitrary Java bytecode residing on the application classpath under the security context of the PaperCut server process.

Risk And Classification

Primary CVSS: v4.0 9.4 CRITICAL from eb41dac7-0af8-4f84-9f6d-0272772514f4

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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-470 | CWE-470 CWE-470 Use of Externally-Controlled input to select classes or code ('unsafe reflection')

VersionSourceTypeScoreSeverityVector
4.0eb41dac7-0af8-4f84-9f6d-0272772514f4Secondary9.4CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/C...
4.0CNACVSS9.4CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS v4.0 Breakdown

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

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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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