CVE-2023-27350 PaperCut MF/NG Improper Access Control

Exploited in the wild Critical 9.8 Published 20 Apr 2023 Updated 21 Oct 2025

Remote attackers can bypass authentication to execute arbitrary code with SYSTEM privileges in PaperCut NG.

Exploited in the wild: Since 21 Apr 2023
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-27350?

CVE-2023-27350 is a critical authentication bypass vulnerability in PaperCut NG, published on 20 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-284

Which versions are affected by CVE-2023-27350?

It affects 2 products.

Products include Papercut Papercut Mf, Papercut Papercut Ng.

How do I fix CVE-2023-27350?

No fix has been published for CVE-2023-27350 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 12 May 2023.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2023-27350 being exploited?

Yes. Attackers have exploited CVE-2023-27350 in the wild since at least 21 Apr 2023, including in ransomware campaigns.

Public exploit code: 1 Metasploit module, 2 Exploit-DB entries, 1 Nuclei template and 14 proofs of concept on GitHub.

Sources

Also known as GHSA-cfg6-7x4x-p3pj.