PaperCut MF/NG Improper Access Control Vulnerability
PaperCut — NG
This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication is not required to exploit this vulnerability. The specific flaw exists within the SetupCompleted class. The issue results from improper access control. An attacker can leverage this vulnerability to bypass authentication and execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-18987.
9.8
100.0%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- Apr 20, 2023
- Modified
- Jun 17, 2026
- Added to KEV
- Apr 21, 2023
- Federal patch due
- May 12, 2023
CISA required action
Apply updates per vendor instructions.
Weakness classification
Affected packages
Proof-of-concept & exploitation references
8 foundWeaponization
Public repositories whose name or description references CVE-2023-27350, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit — cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
- horizon3ai/CVE-2023-27350★ 57
Proof of Concept Exploit for PaperCut CVE-2023-27350
updated Oct 2, 2026
- imancybersecurity/CVE-2023-27350-POC★ 12
updated Dec 6, 2024
- adhikara13/CVE-2023-27350★ 9
Exploit for Papercut CVE-2023-27350. [+] Reverse shell [+] Mass checking
updated Aug 24, 2026
- MaanVader/CVE-2023-27350-POC★ 5
A simple python script to check if a service is vulnerable
updated Jan 7, 2024
- monke443/CVE-2023-27350★ 4
Unauthenticated remote command execution in Papercut service allows an attacker to execute commands due to improper access controls in the SetupCompleted Java class.
updated Apr 28, 2025
- Ap0dexMe0/CVE-2023-27350★ 2
Perfom With Massive Authentication Bypass In PaperCut MF/NG
updated Apr 7, 2025
- Jenderal92/CVE-2023-27350★ 0
Python 2.7
updated May 30, 2026
- 0xB0y426/CVE-2023-27350-PoC★ 0
PoC for CVE-2023-27350
updated Apr 14, 2025
References
How this class of flaw gets exploited
Frequently asked questions
What is CVE-2023-27350?
This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication is not required to exploit this vulnerability. The specific flaw exists within the SetupCompleted class. The issue results from improper access control. An attacker can leverage this vulnerability to bypass authentication and execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-18987.
How severe is CVE-2023-27350?
CVE-2023-27350 has a CVSS base score of 9.8 out of 10 (CVSS 3.1).
Is CVE-2023-27350 actively exploited in the wild?
Yes. CVE-2023-27350 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Apr 21, 2023, meaning CISA has confirmed evidence of active exploitation. It is also flagged as used in ransomware campaigns.
What is the EPSS score for CVE-2023-27350?
100.0% - meaning FIRST.org's EPSS model estimates a 100.0% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2023-27350?
Yes - a public Nuclei template referencing CVE-2023-27350 exist in public repositories we checked. We also found 8 public GitHub repositories referencing this CVE.
What type of vulnerability is CVE-2023-27350?
CVE-2023-27350 is classified under CWE-284 (CWE-284: Improper Access Control).
Cross-checked against
Impactr finds and proves whether CVE-2023-27350 — or flaws like it — are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.