CVE-2023-27351
This vulnerability allows remote attackers to bypass authentication on affected installations of...
CVE-2023-27351 is a high vulnerability (CVSS 8.2) in Papercut Ng, published April 20, 2023. CISA lists it as known to be exploited, since April 20, 2026. EUVD reports exploitation since April 20, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 78.1%, the 99th percentile. No source names a fixed version.
- Severity
- 8.2 HighCVSS 3.0, CVE List
- Exploit chance
- 78.1%EPSS, 99th percentile
- Exploitation
- ExploitedCISA KEV,
- Fixed in
- No fix listedNo source names one
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- Low
- Availability
- None
Exploit likelihood
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Nuclei | PaperCut NG - Authentication Bypass |
What each source reports
CVE List Score used
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.
- Record
CVE-2023-27351- CVSS 3.0
- 8.2 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N - Weakness
- CWE-287
- Updated
- 2026-11-02
EUVDEUVD-2023-31127
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.
- Record
EUVD-2023-31127- CVSS 3.0
- 8.2 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-2c69-r2jh-xjvm
This vulnerability allows remote attackers to bypass authentication on affected installations of...
This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 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.
- Record
GHSA-2c69-r2jh-xjvm- CVSS 3.0
- 8.2 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N - Weakness
- CWE-287
- Updated
- 2026-11-02
CISA KEVNo score
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.
- Record
CVE-2023-27351- Weakness
- CWE-287
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2023-27351- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - CVSS 3.0
- 8.2 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N - Weakness
- CWE-287
- Updated
- 2026-11-02
History
| Recorded | Changed | Sources |
|---|---|---|
| exploitation | ||
| first indexed | CVE List, EUVD, GitHub Advisories, CISA KEV, Nuclei, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.