What’s Vulnerable › Vulnerabilities

CVE-2016-8870

• Severity: high (CVSS 8.1 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 81.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2016-11-04 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• Joomla!: through 3.6.3

References

• http://www.rapid7.com/db/modules/auxiliary/admin/http/joomla_registration_privesc
• http://www.securityfocus.com/bid/93876
• http://www.securitytracker.com/id/1037107
• http://www.securitytracker.com/id/1037108
• https://blog.sucuri.net/2016/10/details-on-the-privilege-escalation-vulnerability-in-joomla.html
• https://developer.joomla.org/security-centre/659-20161001-core-account-creation.html
• https://github.com/joomla/joomla-cms/commit/bae1d43938c878480cfd73671e4945211538fdcf
• https://medium.com/%40showthread/joomla-3-6-4-account-creation-elevated-privileges-write-up-and-exploit-965d8fb46fa2#.rq4qh1v4r
• https://www.exploit-db.com/exploits/40637/
• http://www.rapid7.com/db/modules/auxiliary/admin/http/joomla_registration_privesc
• http://www.securityfocus.com/bid/93876
• http://www.securitytracker.com/id/1037107

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