CVE-2026-82078
CriticalPaperCut NG/MF Unsafe Reflection Vulnerability
- Published
- Aug 28, 2026
- Updated
- Sep 14, 2026
- Vendor
- Papercut
- Affected versions
- See affected products
- Weakness
- CWE-470
Summary
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.
Severity
Critical (9.1)CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0 (9.4)
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Affected products
- Papercut Papercut Mf < 24.1.9
- Papercut Papercut Mf >= 25.0.2, < 25.0.12
- Papercut Papercut Mf >= 26.0.2, < 26.0.4
- Papercut Papercut Ng < 24.1.9
- Papercut Papercut Ng >= 25.0.2, < 25.0.12
- Papercut Papercut Ng >= 26.0.2, < 26.0.4
Exploitation status
Actively exploited
Listed in the CISA Known Exploited Vulnerabilities catalog on Aug 31, 2026. Federal remediation due: Sep 14, 2026.
Technical details
Technical analysis has not been written for this record yet.
Mitigation & remediation
- 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.