CVE-2023-27351 KEV
7.5
HIGH · CVSS 3.1 · EPSS 78.1% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2026-05-04.
Description
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 SecurityRequestFilter class. The issue results from improper implementation of the authentication algorithm. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-19226.
Scoring
| CVSS | 7.5 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| EPSS | 78.05% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-287 |
| On CISA KEV | yes — remediate by 2026-05-04 |
| Public exploit | none known |
| Published | 2023-04-20 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | PaperCut NG/MF Improper Authentication Vulnerability |
|---|---|
| Added | 2026-04-20 |
| Due | 2026-05-04 |
| Vendor / product | PaperCut / NG/MF |
| Ransomware use | known |
Affected (2)
| Vendor | Product |
|---|---|
| papercut | papercut mf |
| papercut | papercut ng |
References
- https://www.papercut.com/kb/Main/PO-1216-and-PO-1219
- https://www.zerodayinitiative.com/advisories/ZDI-23-232/
- https://www.papercut.com/kb/Main/PO-1216-and-PO-1219
- https://www.zerodayinitiative.com/advisories/ZDI-23-232/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27351
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