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Vulnerability record · CVE-2016-9838 · published 16 December 2016

CVE-2016-9838: Joomla\! improper access control vulnerability

Joomla · Joomla\!

An issue was discovered in components/com_users/models/registration.php in Joomla! before 3.6.5. Incorrect filtering of registration form data stored to the session on a validation error enables a user to gain access to a registered user's account and reset the user's group mappings, username, and password, as demonstrated by submitting a form that targets the `registration.register` task.

7.5 CVSS 3.0 High EPSS 14% · top 3.6% CWE-284 · Improper access control
7.5CVSS 3.0 base score, v2 5.0
14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in components/com_users/models/registration.php in Joomla! before 3.6.5. Incorrect filtering of registration form data stored to the session on a validation error enables a user to gain access to a registered user's account and reset the user's group mappings, username, and password, as demonstrated by submitting a form that targets the `registration.register` task.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/94893 Third Party AdvisoryVDB Entry
https://www.exploit-db.com/exploits/41157/
https://www.joomla.org/announcements/release-news/5693-joomla-3-6-5-released.html PatchVendor Advisory
http://www.securityfocus.com/bid/94893 Third Party AdvisoryVDB Entry
https://www.exploit-db.com/exploits/41157/
https://www.joomla.org/announcements/release-news/5693-joomla-3-6-5-released.html PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2016-10033PHPMailer isMail mailSend argument injection enables remote code executionPHPMailer before 5.2.18 fails to properly sanitize the Sender property in the mailSend function of the isMail transport, allowing a crafted backslash…KEVEPSS 100%analysed5.3CVE-2023-23752Joomla! webservice endpoints improper access checkJoomla! 4.0.0 through 4.2.7 contains an improper access check that allows unauthenticated access to webservice endpoints. Because the endpoints can e…KEVEPSS 100%analysed9.8CVE-2026-48902Joomla\! cleartext transmission vulnerabilityThe password and username reset features created plain http links for https connections if the "Force SSL" flag wasn't explicitly set.EPSS 0.33%9.8CVE-2025-25226Joomla\! sql injection vulnerabilityImproper handling of identifiers lead to a SQL injection vulnerability in the quoteNameStr method of the database package. Please note: the affected …EPSS 0.47%9.8CVE-2022-23795Joomla\! improper authentication vulnerabilityAn issue was discovered in Joomla! 2.5.0 through 3.10.6 & 4.0.0 through 4.1.0. A user row was not bound to a specific authentication mechanism which …EPSS 1.1%9.8CVE-2022-23797Joomla\! sql injection vulnerabilityAn issue was discovered in Joomla! 3.0.0 through 3.10.6 & 4.0.0 through 4.1.0. Inadequate filtering on the selected Ids on an request could resulted …EPSS 1.1%9.8CVE-2022-23799Joomla\! vulnerabilityAn issue was discovered in Joomla! 4.0.0 through 4.1.0. Under specific circumstances, JInput pollutes method-specific input bags with $_REQUEST data.EPSS 1.2%9.8CVE-2010-1433Joomla\! unrestricted file upload vulnerabilityJoomla! Core is prone to a vulnerability that lets attackers upload arbitrary files because the application fails to properly verify user-supplied in…EPSS 1.1%

Source: NIST National Vulnerability Database (record CVE-2016-9838), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.