{"basis":"claimed","id":"CVE-2023-27351","name":"PaperCut NG/MF Improper Authentication Vulnerability","vendorProject":"PaperCut","product":"NG/MF","publishedAt":"2023-04-20","cvss":{"score":8.2,"severity":"HIGH","version":"3.0"},"exploited":{"kevAdded":"2026-04-20","dueDate":"2026-05-04","ransomware":true},"epss":{"score":0.78052,"percentile":0.99575,"date":"2026-11-02"},"coverage":{"cloudflare":{"status":"no_history","firstOn":null,"daysToRule":null},"aws":{"status":"none","firstOn":null,"daysToRule":null},"azure":{"status":"none","firstOn":null,"daysToRule":null},"google":{"status":"no_history","firstOn":null,"daysToRule":null},"fastly":{"status":"no_history","firstOn":null,"daysToRule":null},"f5":{"status":"rule","firstOn":"2026-07-07","daysToRule":1174},"akamai":{"status":"no_source","firstOn":null,"daysToRule":null},"crs":{"status":"none","firstOn":null,"daysToRule":null}},"title":null,"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.","cwes":["CWE-287"],"vendors":[{"vendor":"cloudflare","status":"no_history","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"aws","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"azure","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"google","status":"no_history","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"fastly","status":"no_history","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"f5","status":"rule","basis":"claimed","firstOn":"2026-07-07","firstIsNew":true,"daysToRule":1174,"daysAtMost":null,"freePlan":false,"claims":[{"id":"41e937a5e1e71b370a2749e263bdb506a6c0bccfb10895728dae63c24e806760","cve_id":"CVE-2023-27351","vendor":"f5","product":"Attack signatures","rule_id":"200013186","rule_name":"PaperCut NG Authentication Bypass","change":"new","default_action":null,"published_on":"2026-07-07","source_url":"https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog","source_title":"F5 Distributed Cloud attack signatures changelog","excerpt":"Added: signature 200013186 \"PaperCut NG Authentication Bypass\" (Authentication/Authorization Attacks, risk High), systems: Other Web Server. References: CVE-2023-27351.","first_seen_at":"2026-11-02T21:00:24.693Z"}]},{"vendor":"akamai","status":"no_source","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"crs","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]}],"updatedAt":"2026-11-03T03:17:38.270Z","cvssVector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N","ssvc":{"exploitation":"active","automatable":"yes","technicalImpact":"total"},"measured":[{"engineId":"owasp-crs","engineName":"OWASP Core Rule Set","engineVersion":"4.25.0","runtime":"Coraza v3.8.1","config":"paranoia level 1, anomaly threshold 5, default CRS settings","ranAt":"2026-11-02T13:02:57.000Z","verdict":"passed","templateId":"CVE-2023-27351","templatePath":"http/cves/2023/CVE-2023-27351.yaml","requests":2,"blockedRequests":0,"rules":[],"note":"","requestDetail":[{"method":"POST","path":"/rpc/api/rest/master/user/createInternalUser;/keepalive","status":200,"blocked":false,"rules":[]},{"method":"POST","path":"/rpc/api/rest/master/user/getExportedUser;/keepalive","status":200,"blocked":false,"rules":[]}]},{"engineId":"owasp-crs","engineName":"OWASP Core Rule Set","engineVersion":"4.25.0","runtime":"Coraza v3.8.1","config":"paranoia level 2, anomaly threshold 5, default CRS settings","ranAt":"2026-11-02T13:03:28.000Z","verdict":"passed","templateId":"CVE-2023-27351","templatePath":"http/cves/2023/CVE-2023-27351.yaml","requests":2,"blockedRequests":0,"rules":[],"note":"","requestDetail":[{"method":"POST","path":"/rpc/api/rest/master/user/createInternalUser;/keepalive","status":200,"blocked":false,"rules":[]},{"method":"POST","path":"/rpc/api/rest/master/user/getExportedUser;/keepalive","status":200,"blocked":false,"rules":[]}]}],"social":{"total":0,"first_seen":null,"daily":[{"day":"2026-10-21","posts":0},{"day":"2026-10-22","posts":0},{"day":"2026-10-23","posts":0},{"day":"2026-10-24","posts":0},{"day":"2026-10-25","posts":0},{"day":"2026-10-26","posts":0},{"day":"2026-10-27","posts":0},{"day":"2026-10-28","posts":0},{"day":"2026-10-29","posts":0},{"day":"2026-10-30","posts":0},{"day":"2026-10-31","posts":0},{"day":"2026-11-01","posts":0},{"day":"2026-11-02","posts":0},{"day":"2026-11-03","posts":0}],"top_posts":[],"exploit_repositories":[]}}