Disclosure summary
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.
CISA remediation guidance
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.
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
Rapid7 Blog · RSS-a635186c2e057f80741e97b40a875f825d2
Open original source · Updated Sep 11, 2026
Metasploit Wrap Up: This One Goes to Sixteen!
CVE mention in publisher metadata; check the original affected versions.
Original records & references
PUBLISHED 2026-08-31T00:00:00-04:00
MODIFIED 2026-08-31T00:00:00-04:00
INGESTED 2026-10-06T11:42:57-04:00