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TI-2026-56284 Aliases CVE-2026-81578GHSA-44wc-j6f2-7fjr

PaperCut MF/NG: Authentication Bypass

Priority CRITICAL 95Exploited in the wildCWE-305Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · High · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Active In CISA KEV since 2026-08-31CISA due date 2026-09-14
EPSS 0.84734 99th percentileScored 2026-11-07
Fix Fixed PaperCut MF/NG (PaperCut): 24.1.10, 25.0.13, 26.0.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
PaperCutPaperCut MF/NGbefore 24.1.10; 25.0.0 to before 25.0.13; 26.0.0 to before 26.0.524.1.10, 25.0.13, 26.0.5Patch availableCNA
  • PaperCut MF/NG VendorPaperCut Affected before 24.1.10; 25.0.0 to before 25.0.13; 26.0.0 to before 26.0.5 Fixed in 24.1.10, 25.0.13, 26.0.5 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:*before 24.1.9; 25.0.2 to before 25.0.12; 26.0.2 to before 26.0.4VulnerablePaperCut
cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:*before 24.1.9; 25.0.2 to before 25.0.12; 26.0.2 to before 26.0.4VulnerablePaperCut
  • cpe:2.3:a:papercut:papercut_mf:*:*:*:*:*:*:*:* Versions before 24.1.9; 25.0.2 to before 25.0.12; 26.0.2 to before 26.0.4 Vulnerable ·PaperCut
  • cpe:2.3:a:papercut:papercut_ng:*:*:*:*:*:*:*:* Versions before 24.1.9; 25.0.2 to before 25.0.12; 26.0.2 to before 26.0.4 Vulnerable ·PaperCut

Remediation

  • Fix · CNA PaperCut MF/NG (PaperCut) Fixed in 24.1.10, 25.0.13, 26.0.5

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    PaperCut MF/NG 24.1.10, 25.0.13, 26.0.5

    2 records Highest priority Priority CRITICAL 2 CRITICAL

    Other records, highest priority first

    • TI-2026-56642 PaperCut MF/NG: Unsafe Dynamic Class Loading in Database ConnectorPriority CRITICAL 100
    Show all 2 records →

Timeline

  1. 2026-08-31 Added to CISA KEV
  2. 2026-10-02 Threatist record created from CVE-2026-81578
  3. 2026-10-03 Alias added: GHSA-44wc-j6f2-7fjr

References

Patch 3

  • TI-2026-56642 PaperCut MF/NG: Unsafe Dynamic Class Loading in Database Connector KEVCVSS 4.0CRITICAL 9.4
  • TI-2023-12085 Improper access control in PaperCut NG KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-02373 PaperCut MF/NG 22.0.10 (Build 65996 2023-03-27) - Remote code execution via CSRF KEVCVSS 3.1HIGH 8.8
  • TI-2023-12086 Improper authentication in PaperCut NG KEVCVSS 3.1HIGH 7.5
  • TI-2023-20314 PaperCut NG and PaperCut MF before 22.1.3 on Windows allow path traversal, enabling… CVSS 3.1CRITICAL 9.8
  • TI-2024-01136 Incorrect authorization controls in PaperCut NG/MF APIs CVSS 3.1CRITICAL 9.8
See all 30 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences