CVE-2026-81578

CriticalCVSS 9.8/10Known exploited (CISA KEV)Last modified Sep 14, 2026

Description

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-305

Affected software

Vendor	Product	Versions
PaperCut	PaperCut MF/NG	< 24.1.10; >= 25.0.0, < 25.0.13; >= 26.0.0, < 26.0.5

References

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

Timeline

Published: Aug 28, 2026
Last modified: Sep 14, 2026
Added to CISA KEV: Aug 31, 2026
NVD status: Analyzed

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