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CVE-2026-82078— PaperCut MF/NG: Unsafe Dynamic Class Loading in Database Connector

Quick assessment

Affected
PaperCut PaperCut MF/NG
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PaperCut MF 和 PaperCut NG 数据库连接工具中存在一个不安全的动态类加载漏洞。该应用程序会根据可配置的驱动程序名称来实例化数据库驱动类，但并未针对已批准驱动程序的允许列表进行验证。如果攻击者能够操纵系统配置参数，就能够在 PaperCut 服务器进程的安全上下文中，执行位于应用程序类路径中的任意 Java 字节码。

CVSS 9.4 · Critical

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
PaperCut PaperCut MF/NG < 24.1.10, 25.0.13, 26.0.5 affected
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I. Basic Information for CVE-2026-82078

Vulnerability Information
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Vulnerability Title
PaperCut MF/NG: Unsafe Dynamic Class Loading in Database Connector
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
使用外部可控制的输入来选择类或代码(不安全的反射)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
PaperCut PaperCut MF/NG 0 ~ 24.1.10, 25.0.13, 26.0.5 -

II. Public POCs for CVE-2026-82078

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-82078

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Vendor Advisories for CVE-2026-82078 (1)

IV. Related Vulnerabilities

Same product: PaperCut MF/NG
Same vendor: PaperCut
Same weakness: CWE-470

V. Comments for CVE-2026-82078

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