CVE-2016-9838: n/a vulnerability

CVE-2016-9838: An issue was discovered in components/com_users/models/registration.php in 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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 02:59 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2016-9838 affects Joomla! before 3.6.5. A flaw in registration error handling could let a user take over a registered account and change username, password, and group mappings. That creates business risk around account integrity and unauthorized privilege changes on older Joomla sites. Exposure is most likely on Joomla! installations older than 3.6.5, especially internet-facing sites with user registration workflows enabled. The source bundle lacks detailed version ranges beyond “before 3.6.5.” Treat this as a high-priority legacy CMS remediation issue. The business concern is unauthorized account takeover and role manipulation on old Joomla sites, with public exploit material referenced but no confirmed active exploitation in the provided sources. Mitigation focus: Upgrade affected Joomla installations to 3.6.5 or later.; Review Joomla’s 3.6.5 release guidance for vendor-confirmed remediation details.; Inventory public Joomla sites and prioritize internet-facing registration-enabled systems..

Prepared: Jun 13, 2026, 13:16 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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description · low confidence lookup

Credential and access behavior lookup

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Open ATT&CK lookup

cve · low confidence lookup

CVE-2016-9838 mapping review

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Dec 16, 2016, 09:02 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://www.joomla.org/announcements/release-news/5693-joomla-3-6-5-released.htmlCVE reference · x_refsource_CONFIRM
41157CVE reference · exploit, x_refsource_EXPLOIT-DB

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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