CVE-2026-82078: PaperCut NG/MF Unsafe Reflection Vulnerability

Required action (CISA's text)

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.

Description (NVD)

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.

SOURCES

• CISA KEVCISA Known Exploited Vulnerabilities catalog

Other PaperCut flaws

• CVE-2026-81578: PaperCut NG/MF Missing Authentication for Critical Function Vulnerability
• CVE-2023-27351: PaperCut NG/MF Improper Authentication Vulnerability
• CVE-2023-2533: PaperCut NG/MF Cross-Site Request Forgery (CSRF) Vulnerability
• CVE-2023-27350: PaperCut MF/NG Improper Access Control Vulnerability

Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.