CVE-2026-48958 Joomla! Core - [20260712] - Incorrect Access Control in com_fields webservice endpoints
Unauthorized users can create custom fields in Joomla CMS due to incorrect access control in webservice endpoints.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-48958?
CVE-2026-48958 is a medium-severity missing authorization vulnerability in Joomla Joomla\!, published on 7 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
An improper access check allows unauthorized users to create custom fields via webservices endpoints.
Weakness: CWE-284
Which versions are affected by CVE-2026-48958?
1 open source package ship an affected version, including joomla. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
joomla Bitnami | From 4.0.0 | 5.4.7, 6.1.2 |
Products include Joomla Joomla\!.
How do I fix CVE-2026-48958?
Upgrade joomla to a fixed version for your release line: 5.4.7 or 6.1.2.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-48958 being exploited?
There is no known exploitation of CVE-2026-48958 in the wild and no public exploit code.
Other vulnerabilities in Joomla Joomla\!
- CVE-2016-10033 PHPMailer Command Injection
- CVE-2023-23752 Joomla! Improper Access Control
- CVE-2026-48902 Joomla! Core - [20260518] - Transport encryption downgrade for password and username reset links
- CVE-2025-25226 [20250401] - Joomla Framework - SQL injection vulnerability in quoteNameStr method of Database package
- CVE-2022-23795 [20220303] - Core - User row are not bound to a authentication mechanism
Sources
Also known as BIT-joomla-2026-48958, GHSA-c3p9-2r8w-w7xv.