CVE-2026-82078
PaperCut MF/NG: Unsafe Dynamic Class Loading in Database Connector
PaperCut NG/MF Unsafe Reflection Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
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.
CISA notes
https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/?lid=2oneu2wt0ct4 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-82078
Description
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
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:HExploitation Context
as of October 15, 2026- CISA added CVE-2026-82078 to the KEV catalog 3 days after its CVE record was published. The median for entries added in 2026 so far is 14 days.
- It is one of 5 PaperCut entries in the CISA KEV catalog, and one of 3 added in 2026.
- Its current EPSS score (63.5%) is higher than that of 55% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| PaperCut | PaperCut PaperCut MF/NG | 0 to <24.1.10 25.0.0 to <25.0.13 26.0.0 to <26.0.5 |
References
1 LinksRecord Details
More from PaperCut
PaperCut MF/NG: Authentication Bypass
PaperCut NG/MF Improper Authentication Vulnerability
PaperCut MF/NG 22.0.10 (Build 65996 2023-03-27) - Remote code execution via CSRF
PaperCut MF/NG Improper Access Control Vulnerability
Related
Tool categories
CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.