CVE-2016-8870

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Summary

CVECVE-2016-8870
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2016-11-04 21:59:08 UTC
Updated2026-05-06 22:30:45 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.0 8.1 HIGH from [email protected]

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.915130000 probability, percentile 0.996790000 (date 2026-05-10)

Problem Types: CWE-20 | n/a

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary8.1HIGHCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary6.8AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:N/AC:M/Au:N/C:P/I:P/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Joomla Joomla! All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Joomla! Input Validation Flaw Lets Remote Users Gain Elevated Privileges - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com Third Party Advisory, VDB Entry
Joomla (< 3.6.4) Account Creation/Elevated Privileges write-up and exploit – Medium af854a3a-2127-422b-91ae-364da2661108 medium.com
Joomla! Access Control Flaw Lets Remote Users Register on the Target System When Registration is Disabled - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com
Joomla! Core CVE-2016-8870 Security Bypass Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Third Party Advisory, VDB Entry
CVE-2016-8870 Joomla Account Creation and Privilege Escalation | Rapid7 af854a3a-2127-422b-91ae-364da2661108 www.rapid7.com Third Party Advisory
Joomla! 3.4.4 < 3.6.4 - Account Creation / Privilege Escalation af854a3a-2127-422b-91ae-364da2661108 www.exploit-db.com Exploit, Third Party Advisory
Details on the Privilege Escalation Vulnerability in Joomla af854a3a-2127-422b-91ae-364da2661108 blog.sucuri.net
[20161001] - Core - Account Creation af854a3a-2127-422b-91ae-364da2661108 developer.joomla.org Vendor Advisory
Prepare 3.6.4 Stable Release · joomla/joomla-cms@bae1d43 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch
Joomla (< 3.6.4) Account Creation/Elevated Privileges write-up and exploit – Medium MITRE medium.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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