- Critical 9.4
- Known exploited (CISA KEV)
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.
Scores
The facts
- Published
- 28 August 2026
- Last changed
- 14 September 2026
- NVD status
- Analyzed
- Severity
- Critical, CVSS 9.4 out of 10 (version 4.0)
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… - Weakness
- Affects
- papercut papercut mf
- papercut papercut ng
- Known exploited
- Yes. CISA added it to the Known Exploited Vulnerabilities catalogue on 31 August 2026.
- EPSS
- 63.5% chance of exploitation activity in the next 30 days (percentile 99).
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