high7.5Known exploited
CVE-2023-27351
PaperCut NG/MF Improper Authentication Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-04-20. Federal due date: 2026-05-04.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Impact
PaperCut NG/MF contains an improper authentication vulnerability that could allow remote attackers to bypass authentication on affected installations via the SecurityRequestFilter class.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Papercut | Papercut Mf | from 15.0 before 20.1.7 from 21.0.0 before 21.2.11 from 22.0.0 before 22.0.9 |
| Papercut | Papercut Ng | from 15.0 before 20.1.7 from 21.0.0 before 21.2.11 from 22.0.0 before 22.0.9 |