{"id":"CVE-2023-27351","title":"This vulnerability allows remote attackers to bypass authentication on affected installations of PaperCut NG 22.0.5 (Build 63914)","summary":"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 Security…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-287"],"vendor":"papercut","product":"papercut_mf","affected":["papercut_mf >= 15.0, < 20.1.7","papercut_mf >= 21.0.0, < 21.2.11","papercut_mf >= 22.0.0, < 22.0.9","papercut_ng >= 15.0, < 20.1.7","papercut_ng >= 21.0.0, < 21.2.11","papercut_ng >= 22.0.0, < 22.0.9"],"patched":["papercut_mf 22.0.9","papercut_ng 22.0.9"],"published":"2023-04-20","updated":"2026-10-01","sourceUpdated":"2026-10-01T19:17:14.823","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-27351","references":[{"url":"https://www.papercut.com/kb/Main/PO-1216-and-PO-1219","label":"zdi-disclosures@trendmicro.com"},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-23-232/","label":"zdi-disclosures@trendmicro.com"},{"url":"https://www.papercut.com/kb/Main/PO-1216-and-PO-1219","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.zerodayinitiative.com/advisories/ZDI-23-232/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27351","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","kev","in-the-wild","exploit-available","cve.org"],"epss":0.78052,"epssPercentile":0.99573,"kev":true,"kevDateAdded":"2026-04-20","kevDueDate":"2026-05-04","kevRansomware":true,"exploited":true,"exploits":{"nuclei":["CVE-2023-27351"],"checkedAt":"2026-10-27T16:40:59.704Z"},"exploitAvailable":true,"zeroDay":true,"ssvc":{"exploitation":"active","automatable":"yes","technicalImpact":"total","timestamp":"2026-04-21T03:55:38.095423Z"},"scores":{"nvd":7.5,"cna":8.2},"ingestedAt":"2026-10-01T18:55:42.395Z","slug":"CVE-2023-27351","body":"## Overview\n\nThis 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.\n\n## Affected\n\n- `papercut_mf >= 15.0, < 20.1.7`\n- `papercut_mf >= 21.0.0, < 21.2.11`\n- `papercut_mf >= 22.0.0, < 22.0.9`\n- `papercut_ng >= 15.0, < 20.1.7`\n- `papercut_ng >= 21.0.0, < 21.2.11`\n- `papercut_ng >= 22.0.0, < 22.0.9`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `papercut_mf 22.0.9`\n- `papercut_ng 22.0.9`","depth":"abyssal","depthScore":87,"depthScoreParts":{"impact":41.3,"likelihood":15.6,"exploitation":25,"ransomware":5},"changes":[{"seq":214629,"id":"CVE-2023-27351","ts":1790884773799,"field":"cvss","old":"8.2","new":"7.5"}]}