CVE-2026-82078

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.

CVSS v4.0

9.4 CRITICALCVSS: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

9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS

0.93% chance of exploitation in the next 30 days, 58th percentile

CISA KEV

added 2026-08-31

Published

2026-08-28

Updated

2026-09-01

Proof-of-concept exploits (1)

• yora1928/PaperCut-CVE-2026-81578-820781★ · 2026-08-29

References

• CVE Record
• NVD entry

Related

• CVE-2026-15748
• CVE-2026-81578
• CVE-2026-8207
• CVE-2026-8208
• CVE-2026-8206
• CVE-2026-8209