CVE-2026-48904 HIGH

CVE-2026-48904: Joomla! Core - [20260514] - Privilege escalation through com_users webservice endpoints

Vendor Joomla! Project
Product Joomla! CMS
Weakness CWE-284
Published May 26, 2026
Last update May 27, 2026
View on NVD All CVEs

CVSS base score

8.2/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

An improper access check allows privelege escalation through the com_users group editing webservice endpoint.

Explanation of Vulnerability in Simple Terms

02Summary

Joomla! CMS versions 4.0.0 through 5.4.5 contain an access control flaw that allows unauthenticated attackers to modify site data over the network. The vulnerability requires specific timing conditions to exploit but does not require user interaction. Site administrators should update to a version newer than 5.4.5 to remediate this issue.

What an attacker can do

03Attacker Capabilities

Modify site data without authentication by sending network requests under specific timing conditions.

Potential impact on your site

04Site Impact

Attackers can alter site content, settings, or data without logging in, potentially compromising site integrity and user trust.

Conditions required to exploit

05Prerequisites

Network access to the Joomla site; no authentication or user interaction required, but exploitation requires precise timing.

Key dates

06Disclosure timeline

May 26, 2026 CVE published
May 27, 2026 Record updated

Related vulnerabilities

08Related CVE

CVE-2025-4431 Featured Image Plus <= 1.6.4 - Missing Authorization to Authenticated (Subscriber+) Featured Image Update CVE-2020-36831 NextScripts: Social Networks Auto-Poster <= 4.3.17 - Missing Authorization CVE-2026-35223 Joomla! Core - [20260508] - Improper access check in com_config webservice endpoints CVE-2024-11868 LearnPress – WordPress LMS Plugin <= 4.2.7.3 - Course Material Sensitive Information Exposure via REST API CVE-2026-23899 Joomla! Core - [20260306] - Improper access check in webservice endpoints