Exploitation active confirmée

Ajoutée au catalogue CISA KEV le 31/08/2026, correctif exigé avant le 14/09/2026 pour les agences fédérales américaines.

Action requise : 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 officielle (NVD)

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.

Preuves de concept publiques (2)

Dépôts tiers non vérifiés, parfois piégés. Ne les exécutez jamais en production : uniquement dans un environnement de test isolé.

yora1928/PaperCut-CVE-2026-81578-82078 · ★ 4 · 29/08/2026
Security research tool for PaperCut CVE-2026-81578 & CVE-2026-82078
virologi-info/papercut-toolkit · ★ 2 · 29/08/2026
#PaperCut CVE-2026-81578 + CVE-2026-82078 Defense Toolkit 2 3 A **defensive** toolkit to check and understand exposure to the chained

Références

https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/ , Patch, Vendor Advisory
https://github.com/rapid7/metasploit-framework/pull/21842 , Issue Tracking, Patch
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-81578 , Patch, Third Party Advisory, US Government Resource

En bref

Éditeur	PaperCut
Produit	NG/MF
Publiée le	28/08/2026
Modifiée le	14/09/2026
CVSS	8.8 (v4.0)
EPSS	85,58 % (centile 100)
CWE	CWE-305

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N/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

EPSS : probabilité estimée d'exploitation dans les 30 prochains jours.