CVE-2026-82078
PaperCut NG/MF Unsafe Reflection Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-08-31. Federal due date: 2026-09-14.
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.
Impact
PaperCut NG/MF contains an unsafe reflection vulnerability that allows an attacker to manipulate system configuration parameters and execute arbitrary Java bytecode residing on the application classpath under the security context of the PaperCut server process. This vulnerability can be chained with CVE-2026-81578.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| PaperCut | PaperCut MF/NG | from 25.0.0 before 25.0.13 from 26.0.0 before 26.0.5 before 24.1.10 |
| Papercut | Papercut Mf | before 24.1.9 from 25.0.2 before 25.0.12 from 26.0.2 before 26.0.4 |
| Papercut | Papercut Ng | before 24.1.9 from 25.0.2 before 25.0.12 from 26.0.2 before 26.0.4 |