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TI-2026-07731 Aliases CVE-2026-8794GHSA-56w5-2p66-mx39

PaperCut NG/MF: User enumeration via timing attack

Priority LOW 38CWE-208Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-208.

Summary

PaperCut NG/MF contains an observable timing discrepancy in its authentication component. An unauthenticated remote attacker can exploit this vulnerability to perform username enumeration by measuring response times during login attempts. The system executes a password hash comparison only when a valid account is supplied, creating a measurable timing oracle that reveals account existence.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00676 52nd percentileScored 2026-11-07
Fix Fixed PaperCut NG/MF (PaperCut): 26.0.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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 NG/MFbefore 26.0.326.0.3Patch availableCNA
  • PaperCut NG/MF VendorPaperCut Affected before 26.0.3 Fixed in 26.0.3 Patch available CNA

Remediation

  • Fix · CNA PaperCut NG/MF (PaperCut) Fixed in 26.0.3

Fixed in the same release

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

  • Release ·

    PaperCut NG/MF 26.0.3

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-07730 PaperCut NG/MF: Insufficient brute-force protectionPriority LOW 38
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-8794
  2. 2026-10-03 Alias added: GHSA-56w5-2p66-mx39

References

Other 1

  • 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-2026-56284 PaperCut MF/NG: Authentication Bypass KEVCVSS 4.0HIGH 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
See all 42 →

Sources

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