# CVE-2023-27350: PaperCut MF/NG Improper Access Control Vulnerability

- Exploited (CISA KEV): yes, added 2023-04-21, known ransomware use
- Published: 2023-04-20
- CVSS: 9.8 CRITICAL (v3.0)
- EPSS: 100.0% (100th percentile)
- CWE: CWE-284

This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914). Authentication is not required to exploit this vulnerability. The specific flaw exists within the SetupCompleted class. The issue results from improper access control. An attacker can leverage this vulnerability to bypass authentication and execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-18987.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Before feed history | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | Before feed history | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2026-10-21 | 1280 |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

### F5

- 2026-10-21 · new · rule 200013234
  > Added: signature 200013234 "PaperCut NG Authentication Bypass (2)" (Authentication/Authorization Attacks, risk High), systems: Other Web Server. References: CVE-2023-27350.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

## Our test (measured)

- OWASP Core Rule Set 4.25.0, paranoia level 1, anomaly threshold 5, default CRS settings: partial (6 of 10 requests blocked), template CVE-2023-27350, 2026-11-02
- OWASP Core Rule Set 4.25.0, paranoia level 2, anomaly threshold 5, default CRS settings: partial (6 of 10 requests blocked), template CVE-2023-27350, 2026-11-02

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2023-27350 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2023-27350