CVE-2026-72531Network attack vector

Unauthorized field creation via improper ACL checks

Published Aug 18, 2026 · Updated Aug 19, 2026

Incorrect access control in custom fields webservice endpoints in Joomla! CMS before 5.4.8 and 6.1.3 lets remote authenticated users create fields. The affected API endpoints accept field-creation requests without enforcing the same component-level ACL restrictions applied in the backend UI, so requests can target components that should be inaccessible. Exploitation requires an authenticated account with API reachability and is described as unauthorized field creation and related integrity changes, with no published evidence of code execution or service interruption.

CVSS severity5.1
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Incorrect access control in custom fields webservice endpoints in Joomla! CMS before 5.4.8 and 6.1.3 lets remote authenticated users create fields. The affected API endpoints accept field-creation requests without enforcing the same component-level ACL restrictions applied in the backend UI, so requests can target components that should be inaccessible. Exploitation requires an authenticated account with API reachability and is described as unauthorized field creation and related integrity changes, with no published evidence of code execution or service interruption.

The record

CVE
CVE-2026-72531
Published
Aug 18, 2026
Updated
Aug 19, 2026
Vendor
Joomla! Project
Product
Joomla! CMS
Classifications
CWE-284
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.0.0-5.4.6
  2. Affected versionversion=6.0.0-6.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Joomla! Project · Joomla! CMSversion=4.0.0-5.4.6; version=6.0.0-6.1.2

Published CVSS scores

5.1Joomla! ProjectCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo