CVE-2026-82078
PaperCut MF/NG: Unsafe Dynamic Class Loading in Database Connector
KEVCRITICAL 9.4EPSS 63.5%
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.
- Affected
- PaperCut · PaperCut MF/NG
- CVSS v4.0 CNA
- 9.4 CRITICAL
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 - CVSS v3.1 NVD
- 9.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - EPSS
- 63.53% chance of exploitation in the next 30 days, 99th percentile
- CISA KEV
- added 2026-08-31
- Published
- 2026-08-28
- Updated
- 2026-09-13
Proof-of-concept exploits (1)
- yora1928/PaperCut-CVE-2026-81578-820784★ · 2026-08-29
Metasploit modules (1)
Security advisories
- https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-82078
- rapid7/metasploit-framework/pull/21842