CVE-2023-27350: in the CISA KEV catalogue
PaperCut MF/NG Improper Access Control Vulnerability. CISA added CVE-2023-27350 to the Known Exploited Vulnerabilities catalogue on 2023-04-21 with a default due date of 2023-05-12. Known ransomware campaign use: Known. Forensic triage flag: No.
PaperCut MF/NG contains an improper access control vulnerability within the SetupCompleted class that allows authentication bypass and code execution in the context of system. (CISA description)
- Vendor / product
- PaperCut MF/NG
- CWE
- CWE-284
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 100%, percentile 99 (scored 2026-11-03)
EPSS puts nearly every time in 100 odds (100%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 99% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2023-27350 in the CISA KEV catalogue?
Yes. CISA added CVE-2023-27350 (PaperCut MF/NG Improper Access Control Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2023-04-21. CISA's default due date for it is 2023-05-12.
Is CVE-2023-27350 used in ransomware attacks?
CISA marks known ransomware campaign use as Known for CVE-2023-27350.
What should I do about CVE-2023-27350?
CISA's required action: Apply updates per vendor instructions.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2023-27350