VulnerabilityALERT Critical

CVE-2023-27351: PaperCut NG/MF Improper Authentication Vulnerability

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

Impact

CISA lists CVE-2023-27351 as known exploited in the wild for PaperCut NG/MF. Ransomware campaign use: Known. Federal remediation due date: 2026-05-04.

Recommended 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.

Published: 4/20/2026, 12:00:00 AMSource: CISA Known Exploited Vulnerabilities CatalogTags: CVE-2023-27351, PaperCut, NG/MF, CISA KEV, CWE-287