CVE Watch14 de set. de 2026

CVE-2026-82078

PaperCut NG/MF Unsafe Reflection Vulnerability

CVSS

9.1

Crítica

EPSS

63.0%

p99

KEV

SIM

31 de ago. de 2026

Exploit Today

0-100

Publicado: 28 de ago. de 2026 · Última mod.: 14 de set. de 2026 · CWE-470

EPSS · 30d

60.9%EPSS · 30 dias63.5%

2026-10-082026-11-05

Ficha do catálogo KEV

Produto

PaperCut / NG/MF

Vulnerabilidade

PaperCut NG/MF Unsafe Reflection Vulnerability

Adicionado ao KEV

31 de ago. de 2026

Corrigir até

14 de set. de 2026

Uso conhecido em ransomware

Não

Descrição resumida

PaperCut NG/MF contains an unsafe reflection vulnerability that allows an attacker to manipulate system configuration parameters and execute arbitrary Java bytecode residing on the application classpath under the security context of the PaperCut server process. This vulnerability can be chained with CVE-2026-81578.

Ação necessária

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.

Notas

https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/?lid=2oneu2wt0ct4 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-82078

Descrição técnica

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.

Referências oficiais

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