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.
- Vendor
- PaperCut
- Product
- NG/MF
- CVSS
- 7.5
- EPSS (exploit probability)
- 78.1%
- Status
- kevransomware use
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2023-27351 being exploited?
Yes. CISA added CVE-2023-27351 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild. CISA marks it as known to be used in ransomware campaigns.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 78.1% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-25. Full cross-catalog view: /kev-comparison
CVE-2023-27351 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
US federal civilian agencies must remediate by (14 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other PaperCut CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2023-2533 PaperCut NG/MF Cross-Site Request Forgery (CSRF) Vulnerability | [ HIGH ] | 8.4 | 28.8% | |
| CVE-2023-27350 PaperCut MF/NG Improper Access Control Vulnerabilityransomware use | [ CRITICAL ] | 9.8 | 100.0% |