CVE-2026-81578

PaperCut MF/NG: Authentication Bypass

Published Aug 28, 2026 CVSS 4.0 · 8.8 High EPSS 84.7% KEV · Listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Papercut
Papercut papercut Mf
Papercut papercut Ng
CPEs cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*
cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*
Vendors & Products Papercut
Papercut papercut Mf
Papercut papercut Ng
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics kev

{'dateAdded': '2026-08-28T00:00:00+00:00', 'dueDate': '2026-09-11T00:00:00+00:00'}

Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title PaperCut MF/NG: Authentication Bypass
Weaknesses CWE-305
References
Metrics cvssV4_0

{'score': 8.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
PaperCut
Published
Updated
Sep 13, 2026, 11:15 PM
Reserved
Aug 27, 2026, 7:34 AM
Status
Analyzed
Published
Aug 28, 2026, 4:18 PM
Modified
Sep 14, 2026, 12:16 AM