CVE-2023-27351

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.

CVSS v3.1

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.0

8.2 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS

78.05% chance of exploitation in the next 30 days, 100th percentile

CISA KEV

added 2026-04-20, used in ransomware campaigns

Nuclei

high · CWE-287

Published

2023-04-20

Updated

2026-04-21

Proof-of-concept exploits (2)

• HORKimhab/CVE-2023-27350-CVE-2023-273510★ · 2026-08-28
• mjh134/--POC

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-27351.yaml

References

• CVE Record
• NVD entry

Related

• CVE-2025-14518
• CVE-2026-7746
• CVE-2023-27350
• CVE-2023-27363
• CVE-2023-2734
• CVE-2023-27372