Patch nowWhy this label: EPSS 61%

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

Product: PaperCut NG/MF
Added to CISA KEV: August 31, 2026
Deadline for US federal agencies: September 14, 2026
Known ransomware use: Not known
EPSS, next 30 days: 61%, in the top 1% of scored CVEs (Oct 25, 2026)
Weakness: CWE-470

What CISA says

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.

What CISA asks you to do

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.

Sources

Also exploited recently

Data from CISA's Known Exploited Vulnerabilities catalog (public domain) and FIRST EPSS, refreshed hourly. Rheono did not find or test this vulnerability; this page summarizes public sources.