{"id":"CVE-2016-8870","url":"https://www.cyber-defence.io/tools/cve/CVE-2016-8870","generatedAt":"2026-10-28T19:03:36.841Z","title":"The register method in the UsersModelRegistration class in controllers/user.php in the Users component in Joomla! before 3.6.4, when registration has been disabled, allows remote attackers to create user accounts by leveraging failure to check the Allow…","description":"The register method in the UsersModelRegistration class in controllers/user.php in the Users component in Joomla! before 3.6.4, when registration has been disabled, allows remote attackers to create user accounts by leveraging failure to check the Allow User Registration configuration setting.","published":"2016-11-04T21:59:09.000Z","lastModified":"2026-06-17T00:55:07.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.0","score":8.1,"severity":"HIGH","vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-20"],"affected":["joomla/joomla\\!"],"epss":{"score":0.81136,"percentile":0.99631,"date":"2026-10-27","history":[{"date":"2026-09-21","score":0.82996,"percentile":0.99666},{"date":"2026-09-22","score":0.81207,"percentile":0.99617}]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2016-10-27","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":40637,"kind":"exploit","title":"Joomla! 3.4.4 < 3.6.4 - Account Creation / Privilege Escalation","url":"https://www.exploit-db.com/exploits/40637","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/php/webapps/40637.txt","file":"exploits/php/webapps/40637.txt","published":"2016-10-27","added":"2016-10-27","updated":"2016-11-16","author":"Xiphos Research Ltd","type":"webapps","platform":"php","port":80,"verified":false,"codes":["CVE-2016-8869","CVE-2016-8870"],"tags":null,"aliases":null,"applicationUrl":"http://www.exploit-db.comJoomla_3.4.4-Stable-Full_Package.zip","screenshotUrl":null,"referenceUrl":"https://github.com/XiphosResearch/exploits/tree/master/Joomraa"}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 81.1%, higher than 100% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://www.rapid7.com/db/modules/auxiliary/admin/http/joomla_registration_privesc","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://www.securityfocus.com/bid/93876","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id/1037107","source":"cve@mitre.org"},{"url":"http://www.securitytracker.com/id/1037108","tags":["Third Party Advisory","VDB Entry"],"source":"cve@mitre.org"},{"url":"https://blog.sucuri.net/2016/10/details-on-the-privilege-escalation-vulnerability-in-joomla.html","source":"cve@mitre.org"},{"url":"https://developer.joomla.org/security-centre/659-20161001-core-account-creation.html","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/joomla/joomla-cms/commit/bae1d43938c878480cfd73671e4945211538fdcf","tags":["Patch"],"source":"cve@mitre.org"},{"url":"https://medium.com/%40showthread/joomla-3-6-4-account-creation-elevated-privileges-write-up-and-exploit-965d8fb46fa2#.rq4qh1v4r","source":"cve@mitre.org"},{"url":"https://www.exploit-db.com/exploits/40637/","tags":["Exploit","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://www.rapid7.com/db/modules/auxiliary/admin/http/joomla_registration_privesc","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securityfocus.com/bid/93876","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1037107","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1037108","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://blog.sucuri.net/2016/10/details-on-the-privilege-escalation-vulnerability-in-joomla.html","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://developer.joomla.org/security-centre/659-20161001-core-account-creation.html","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/joomla/joomla-cms/commit/bae1d43938c878480cfd73671e4945211538fdcf","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://medium.com/%40showthread/joomla-3-6-4-account-creation-elevated-privileges-write-up-and-exploit-965d8fb46fa2#.rq4qh1v4r","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.exploit-db.com/exploits/40637/","tags":["Exploit","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2016-8870","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}