CVE-2026-90907
Received Received - Intake

Unauthorized User Account Creation in Joomla Core

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Joomla! Project

Description
Joomla! Core - [20260902] - Core - Unauthorized user account creation via profile.save controller in Joomla 1.5.0-5.4.8, 6.0.0-6.1.3 - The profile.save controller did not check the login state of a user, allowing the creation of guest-level users on sites without active user registration.

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-90907
EUVD
EUVD-2026-89085

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
joomla joomla From 1.5.0 (inc) to 5.4.9 (exc)
joomla joomla From 6.0.0 (inc) to 6.1.4 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

Attack-Flow Graph

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Executive Summary

CVE-2026-90907 is an authorization bypass vulnerability in Joomla! CMS versions 1.5.0-5.4.8 and 6.0.0-6.1.3. It allows unauthorized creation of guest-level user accounts through the profile.save controller, even when user registration is disabled on the site.

Detection Guidance

Check Joomla version by inspecting the administrator/components/com_admin/version.php file or via the Joomla admin panel under System Information. Look for unauthorized guest accounts in Users > Manage > User Manager. Review server logs for suspicious profile.save controller requests.

Impact Analysis

This vulnerability could allow attackers to create unauthorized user accounts on your Joomla site. This may lead to unauthorized access, potential data manipulation, or further exploitation of your site's resources if not patched.

Mitigation Strategies

Upgrade Joomla to version 5.4.9 or 6.1.4 immediately. If upgrading is not possible, disable the profile.save controller or restrict access to it via .htaccess rules. Monitor user accounts for unauthorized guest-level entries and remove any suspicious accounts.

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