---
title: "CVE-2026-82078: PaperCut MF/NG: Unsafe Dynamic Class… | CubePath"
description: "An unsafe dynamic class loading vulnerability exists in the database connection utilities of PaperCut MF and PaperCut NG. The application instantiates…"
language: en
source: https://cubepath.com/security/cve/CVE-2026-82078
---

# CVE-2026-82078: PaperCut MF/NG: Unsafe Dynamic Class… | CubePath

## Description

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.

Official description from the CVE record, published by PaperCut. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-82078)

## Key data

### CVSS 4.0 Critical 9.4

Score published by PaperCut in the CVE record.

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

| Metric                              | Value   | What it means                                                                                                   |
| ----------------------------------- | ------- | --------------------------------------------------------------------------------------------------------------- |
| Attack vector                       | Network | The vulnerable component can be reached over a network, possibly from the Internet.                             |
| Attack complexity                   | Low     | No measurable action is needed to get around the system's built-in security controls. The attack is repeatable. |
| Attack requirements                 | None    | The attack works without any special deployment or execution conditions.                                        |
| Privileges required                 | High    | An account with significant privileges, such as an administrator, is needed.                                    |
| User interaction                    | None    | No action from any user is needed.                                                                              |
| Vulnerable system: confidentiality  | High    | Serious or total effect on the secrecy of data.                                                                 |
| Vulnerable system: integrity        | High    | Serious or total effect on the trustworthiness of data.                                                         |
| Vulnerable system: availability     | High    | Serious or total effect on availability.                                                                        |
| Subsequent systems: confidentiality | High    | Serious or total effect on other systems' data secrecy.                                                         |
| Subsequent systems: integrity       | High    | Serious or total effect on other systems' data trustworthiness.                                                 |
| Subsequent systems: availability    | High    | Serious or total effect on other systems' availability.                                                         |

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) .

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.63047 (63.0% probability)

Percentile

99.2%

Scores of

Nov 10, 2026

Model

v2026.06.15

### CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.

Name in the catalog

PaperCut NG/MF Unsafe Reflection Vulnerability

Added to the catalog

Aug 31, 2026

Federal due date

Sep 14, 2026

### CISA assessment as of Aug 28, 2026

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation

Recorded by CISA as active

Automatable

no

Technical impact

total

### Weakness (CWE)

CWE catalog version 5.0.

CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license.

- [CWE-470](https://cwe.mitre.org/data/definitions/470.html) Use of Externally-Controlled Input to Select Classes or Code

## Affected products

Products listed in the CVE record, as the CNA published them.

- PaperCut MF/NG

  - affected: before 24.1.10
  - affected: 25.0.0 up to before 25.0.13
  - affected: 26.0.0 up to before 26.0.5

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-s…](https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/)

## Timeline

1. ID reserved Aug 28, 2026
2. Record published Aug 28, 2026
3. Added to CISA KEV Aug 31, 2026
4. Record last updated Sep 13, 2026

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:08 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)