PaperCut NG 22.0.5 Auth Bypass via SecurityRequestFilter
CVE-2023-27351 Published on April 20, 2023
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.
Known Exploited Vulnerability
This PaperCut NG/MF Improper Authentication Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. PaperCut NG/MF contains an improper authentication vulnerability that could allow remote attackers to bypass authentication on affected installations via the SecurityRequestFilter class.
The following remediation steps are recommended / required by May 4, 2026: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness Type
What is an authentification Vulnerability?
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
CVE-2023-27351 has been classified to as an authentification vulnerability or weakness.
Products Associated with CVE-2023-27351
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Affected Versions
PaperCut NG Version 22.0.5 (Build 63914) is affected by CVE-2023-27351Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.