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CVE-2023-27351

HighPublished

PaperCut NG/MF Improper Authentication Vulnerability

Published: Apr 20, 2023
Updated: Apr 21, 2026
Assigning CNA: zdi
Evidence observed: Apr 20, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS probability estimate

78.1%

High · next 30 days

Percentile: 99.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

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.

Sources

CVE-2023-27350-CVE-2023-27351PoC
Educational proof-of-concept for PaperCut pre-auth RCE chain (CVE-2023-27350, CVE-2023-27351) with setup scripts and authorized testing guidance.

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