PaperCut MF/NG: Unsafe Dynamic Class Loading in Database Connector
At a glance
Severity
CRITICAL 9.4
Exploitation
Known exploited (CISA KEV) · added 2026-08-31 Exploited per ENISA since 2026-08-27
EPSS
EPSS 60.89 % · percentile 99 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
PaperCut
NVD status
Analyzed
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.
