CVE-2026-87739
Received Received - Intake

Improper Authentication in PaperCut MF/NG Allows Unauthorized Report Access

Publication date: 2026-09-24

Last updated on: 2026-09-24

Assigner: PaperCut

Description
An improper authentication vulnerability in PaperCut MF/NG allows an unauthenticated, remote attacker to trigger report generation. By submitting report generation requests without valid credentials, an attacker can generate reports and gain unauthorized access to sensitive information.

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Meta Information

Published
2026-09-24
Last Modified
2026-09-24
Generated
2026-09-24
AI Q&A
2026-09-24
EPSS Evaluated
N/A
NVD
CVE-2026-87739
EUVD
EUVD-2026-85812

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
papercut mf *
papercut ng *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

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Executive Summary

This vulnerability is an improper authentication issue in PaperCut MF/NG software. It allows an unauthenticated remote attacker to generate reports without valid credentials, potentially gaining unauthorized access to sensitive information.

Detection Guidance

To detect this vulnerability, monitor for unauthorized report generation requests in PaperCut MF/NG logs. Check for repeated requests to report generation endpoints without valid authentication tokens or session cookies. Look for unusual network traffic patterns targeting PaperCut services on ports 9191 or 9192.

Impact Analysis

An attacker could exploit this to access sensitive data through report generation, leading to data breaches or unauthorized information disclosure. The impact includes potential loss of confidentiality for stored information.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR and HIPAA due to unauthorized data access. GDPR requires protection of personal data, while HIPAA mandates safeguards for protected health information. Exploitation may result in violations and associated penalties.

Mitigation Strategies

Apply the latest security patches from PaperCut MF/NG immediately. Disable report generation features if not required. Restrict network access to PaperCut servers via firewalls. Monitor for unauthorized report generation attempts in logs.

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