CVE-2026-81578
Received Received - Intake

Improper Access Control in PaperCut MF and PaperCut NG

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: PaperCut

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.

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Meta Information

Published
2026-08-28
Last Modified
2026-08-28
Generated
2026-08-29
AI Q&A
2026-08-28
EPSS Evaluated
N/A
NVD
CVE-2026-81578
EUVD
EUVD-2026-67713

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
papercut papercut_mf *
papercut papercut_ng *
papercut papercut_mf to prior_to (exc)
papercut papercut_ng to prior_to (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-305 The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.

Attack-Flow Graph

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Executive Summary

This vulnerability is an improper access control issue in the web management interface of PaperCut MF and PaperCut NG. It allows unauthenticated remote attackers to send requests that trigger backend administrative actions before access validation completes. This can lead to unauthorized modification of system configurations.

Detection Guidance

This vulnerability involves improper access control in PaperCut MF and NG web interfaces. To detect it, check for unauthenticated requests to administrative endpoints or unusual system configuration changes. Monitor logs for suspicious activity targeting the web management interface, especially requests before authentication completion.

Impact Analysis

An attacker could exploit this to change system settings without authentication, potentially disrupting services, altering configurations, or gaining unauthorized access to sensitive data managed by PaperCut.

Compliance Impact

This vulnerability could lead to unauthorized data access or modifications, violating confidentiality and integrity requirements in GDPR and HIPAA. Organizations using affected PaperCut versions may face compliance violations and potential penalties.

Mitigation Strategies

Immediately apply the latest security patches or updates provided by PaperCut for MF and NG versions. Ensure the web management interface is not exposed to untrusted networks or the internet. Review and restrict access to administrative functions to authorized users only.

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