CVE-2026-82078 PaperCut NG/MF Unsafe Reflection

What is CVE-2026-82078?

CVE-2026-82078 is a critical code injection vulnerability in PaperCut MF/NG, published on 28 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official 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.

Weakness: CWE-470

Which versions are affected by CVE-2026-82078?

It affects 2 products.

Products include Papercut Papercut Mf, Papercut Papercut Ng.

How do I fix CVE-2026-82078?

No fix has been published for CVE-2026-82078 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 14 Sep 2026.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2026-82078 being exploited?

Yes. Attackers have exploited CVE-2026-82078 in the wild since at least 31 Aug 2026.

Public exploit code: 1 Metasploit module.

Other vulnerabilities in PaperCut MF/NG

• CVE-2023-27350 PaperCut MF/NG Improper Access Control Exploited Critical 9.8
• CVE-2026-81578 PaperCut NG/MF Missing Authentication for Critical Function Exploited High 8.8
• CVE-2023-2533 PaperCut NG/MF Cross-Site Request Forgery (CSRF) Exploited High 8.4
• CVE-2023-27351 PaperCut NG/MF Improper Authentication Exploited High 8.2
• CVE-2023-39143 Path traversal in n/a Critical 9.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-mjg5-wj9r-9mfx.