CVEvulnerability

CVE-2023-27351

7.5 HIGH Known exploited Published 2023-04-20 Modified 2026-10-01 Official page ↗

CISA Known Exploited Vulnerability

PaperCut NG/MF Improper Authentication Vulnerability — PaperCut NG/MF

PaperCut NG/MF contains an improper authentication vulnerability that could allow remote attackers to bypass authentication on affected installations via the SecurityRequestFilter class.

Added to KEV: 2026-04-20
Remediation due: 2026-05-04
Ransomware use: Known
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes: https://www.papercut.com/kb/Main/PO-1216-and-PO-1219 ; https://nvd.nist.gov/vuln/detail/CVE-2023-27351

Status: Analyzed
Published: 2023-04-20
Last modified: 2026-10-01
Assigner: [email protected]
CVSS 3.1 ([email protected]): 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 3.0 ([email protected]): 8.2 HIGH — CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Weaknesses: CWE-287

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 SecurityRequestFilter class. The issue results from improper implementation of the authentication algorithm. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-19226.

Affected configurations

• papercut papercut mf (>= 15.0 < 20.1.7) • papercut papercut mf (>= 21.0.0 < 21.2.11) • papercut papercut mf (>= 22.0.0 < 22.0.9) • papercut papercut ng (>= 15.0 < 20.1.7) • papercut papercut ng (>= 21.0.0 < 21.2.11) • papercut papercut ng (>= 22.0.0 < 22.0.9)

Weakness · CWE (1)

CWE-287 Improper Authentication weakness

References