CVE intelligenceCISA KEV

CVE-2026-82078

PaperCut NG/MF Unsafe Reflection Vulnerability

Published Aug 28, 2026Sources checked Sep 12, 2026

9.1CRITICALCVSS out of 10

What this means

Actively exploited

CISA lists CVE-2026-82078 in its Known Exploited Vulnerabilities catalog, which means exploitation has been observed. The entry applies to PaperCut NG/MF.

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.

CISA KEVListedObserved exploitation

EPSS1.7%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors2Source-linked actor relationships

Overview

What is CVE-2026-82078?

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.