CVE-2026-82078
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.
How to fix
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 due date: Sep 14, 2026- papercut papercut_mf24.1.9, 25.0.12, 26.0.4 or later
- papercut papercut_ng24.1.9, 25.0.12, 26.0.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| papercut papercut_mf | v < 24.1.9, 25.0.2 ≤ v < 25.0.12, 26.0.2 ≤ v < 26.0.4 | 24.1.9, 25.0.12, 26.0.4 |
| papercut papercut_ng | v < 24.1.9, 25.0.2 ≤ v < 25.0.12, 26.0.2 ≤ v < 26.0.4 | 24.1.9, 25.0.12, 26.0.4 |
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