Brute-Force Vulnerability in PaperCut NG/MF Login Component
CVE-2026-8793

6.9MEDIUM

Key Information:

Vendor

Papercut

Status
Papercut Ng/mf
Vendor
CVE Published:
3 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-8793?

The PaperCut NG/MF software experiences a vulnerability in its login component that inadequately restricts excessive authentication attempts. This weakness can be exploited by unauthenticated remote attackers to launch brute-force or credential-stuffing attacks. In specific configurations, attackers can circumvent account lockout and rate-limiting measures, potentially compromising user accounts without alerting system defenses.

Affected Version(s)

PaperCut NG/MF 0 < 26.0.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-8793
Created by H4zaz

References

https://www.papercut.com/kb/Main/papercut-ng-mf-security-...

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Vivien Lebas
.