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VULNERABILITIES

CVE-2026-81578 Details

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.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://github.com/rapid7/metasploit-framework/pull/21842 CISA-ADPIssue TrackingPatch
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-81578 CISA-ADPPatchThird Party AdvisoryUS Government Resource
https://www.papercut.com/kb/Main/security-bulletin-27-aug-2026-urgent-security-advisory/ PaperCutPatchVendor Advisory

This CVE is in CISA's Known Exploited Vulnerabilities Catalog

Reference CISA's BOD 22-01 and Known Exploited Vulnerabilities Catalog for further guidance and requirements.

Vulnerability NameDate AddedDue DateRequired Action
PaperCut NG/MF Missing Authentication for Critical Function VulnerabilityAug 31, 2026Sep 14, 2026Apply 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.

Weakness Enumeration

CWE-IDCWE NameSource
CWE-305Authentication Bypass by Primary WeaknessPaperCut

Affected Products

ProductVersions
papercut papercut mf
< 24.1.9
>= 25.0.2, < 25.0.12
>= 26.0.2, < 26.0.4

CPE

  • cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.
papercut papercut ng
< 24.1.9
>= 25.0.2, < 25.0.12
>= 26.0.2, < 26.0.4

CPE

  • cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

10 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-81578
NVD Published Date:
Aug 28, 2026
NVD Last Modified:
Sep 14, 2026
Source:
PaperCut
CVE-2026-81578 Details - Not Deferred