CVE-2023-27351 (GCVE-0-2023-27351)

Vulnerability from cvelistv5 – Published: 2023-04-20 00:00 – Updated: 2026-04-21 03:55
VLAI? CISA KEV
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.
Severity ?
8.2 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
CWE
  • CWE-287 - Improper Authentication
Assigner
zdi
References
Impacted products
Vendor Product Version
PaperCut NG Affected: 22.0.5 (Build 63914)
Create a notification for this product.
Credits
Piotr Bazydlo (@chudypb) of Trend Micro Zero Day Initiative
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: afc31ae0-5131-4a1e-b730-41f499c91536

Vulnerability ID: CVE-2023-27351

Status: Confirmed

Status Updated: 2026-04-20 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-04-20
Asserted: 2026-04-20
Scope
Notes: KEV entry: PaperCut NG/MF Improper Authentication Vulnerability | Affected: PaperCut / NG/MF | Description: PaperCut NG/MF contains an improper authentication vulnerability that could allow remote attackers to bypass authentication on affected installations via the SecurityRequestFilter class. | 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. | Due date: 2026-05-04 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://www.papercut.com/kb/Main/PO-1216-and-PO-1219 ; https://nvd.nist.gov/vuln/detail/CVE-2023-27351
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-287
Feed CISA Known Exploited Vulnerabilities Catalog
Product NG/MF
Due Date 2026-05-04
Date Added 2026-04-20
Vendorproject PaperCut
Vulnerabilityname PaperCut NG/MF Improper Authentication Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-04-20 20:00 UTC | Updated: 2026-04-20 20:00 UTC
Show details on NVD website
To clipboard 

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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.