CVE-2026-82078

Analyzed
Published: 28 Aug 2026, 11:45
Last modified:31 Aug 2026, 15:29

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.4 CRITICAL
v4.0 (cve.org)
EPSS Score
0.46% LOW
0% probability 0.00%
KEV
Listed
CISA
1 listing
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

28 Aug 2026, 11:45
Published
Vulnerability first disclosed
31 Aug 2026, 00:00
Added to CISA KEV
PaperCut NG/MF Unsafe Reflection Vulnerability
31 Aug 2026, 15:29
Last Modified
Vulnerability information updated
14 Sept 2026, 00:00
CISA Remediation Due
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.

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.

CVSS Metrics

  • v4.0•CRITICAL•Score: 9.4CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
  • v4.0•CRITICAL•Score: 9.4CVSS: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
  • v3.1•CRITICAL•Score: 9.1CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.46%• Percentile: 38%

Techniques & Countermeasures

  • CWE-470•Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')

    The product uses external input with reflection to select which classes or code to use, but it does not sufficiently prevent the input from selecting improper classes or code.

Affected Systems

  • papercut•papercut_mf

    < 24.1.9 | ≥ 25.0.2, < 25.0.12 | ≥ 26.0.2, < 26.0.4

  • papercut•papercut mf/ng

    < 24.1.10, 25.0.13, 26.0.5

  • papercut•papercut_ng

    < 24.1.9 | ≥ 25.0.2, < 25.0.12 | ≥ 26.0.2, < 26.0.4

References (3)