CVE-2026-81578

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.

Affected products

Papercut Mf, Papercut Ng

Papercut Papercut Mf

< 24.1.9, 25.0.12, 26.0.4

Papercut Papercut Ng

< 24.1.9, 25.0.12, 26.0.4

CVSS 3.1

9.8 CRITICAL

EPSS

0.4% (32th percentile)

Weakness

CWE-305

NVD status

Analyzed

Published

2026-08-28