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CVE-2026-82078

CriticalPublished

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

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

Primary CVSS

9.4/ 10Critical

nvd · CVSS 4.0

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

EPSS probability estimate

3.6%

Low · next 30 days

Percentile: 88.9%
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 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.

Sources

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

Responsible use

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