CVE Watch14 sept 2026

CVE-2026-81578

PaperCut NG/MF Missing Authentication for Critical Function Vulnerability

CVSS

9.8

Crítico

EPSS

85.6%

p100

KEV

SÍ

31 ago 2026

Exploit Today

0-100

Publicado: 28 ago 2026 · Última mod.: 14 sept 2026 · CWE-305

EPSS · 30d

1.6%EPSS · 30 días85.6%

2026-09-142026-10-12

Ficha del catálogo KEV

Producto

PaperCut / NG/MF

Vulnerabilidad

PaperCut NG/MF Missing Authentication for Critical Function Vulnerability

Añadido a KEV

31 ago 2026

Remediar antes de

14 sept 2026

Uso conocido en ransomware

Descripción resumida

PaperCut NG/MF contains a missing authentication for critical function vulnerability which allows an unauthenticated remote attacker to modify certain system configurations. This vulnerability can be chained with CVE-2026-82078.

Acción requerida

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/ ; 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-2026-81578

Descripción técnica

An improper access control vulnerability exists in the web management interface of PaperCut MF and PaperCut NG. Under specific conditions, unauthenticated remote requests targeting administrative functions can trigger backend actions prior to the completion of access validation checks. This allows an unauthenticated remote attacker to modify certain system configurations.

Referencias oficiales

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