ACTIVELY EXPLOITED
CVE-2023-27351: PaperCut NG/MF Improper Authentication Vulnerability
| Vendor | PaperCut |
|---|---|
| Product | NG/MF |
| Actively exploited | Yes |
| Added to CISA KEV | 20 Apr 2026 |
| CISA federal deadline | 4 May 2026 |
| Ransomware use | Known |
| Weakness (CWE) | CWE-287 |
Required action (CISA's text)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Description (NVD)
PaperCut NG/MF contains an improper authentication vulnerability that could allow remote attackers to bypass authentication on affected installations via the SecurityRequestFilter class.
SOURCES
Other PaperCut flaws
- CVE-2026-82078: PaperCut NG/MF Unsafe Reflection Vulnerability
- CVE-2026-81578: PaperCut NG/MF Missing Authentication for Critical Function Vulnerability
- CVE-2023-2533: PaperCut NG/MF Cross-Site Request Forgery (CSRF) Vulnerability
- CVE-2023-27350: PaperCut MF/NG Improper Access Control Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.