Joomla CMS up to 5.4.5/6.1.0 com_users access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Joomla CMS up to 5.4.5/6.1.0. This vulnerability affects unknown code of the component com_users. This manipulation causes access control. This vulnerability is handled as CVE-2026-48904. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Joomla CMS up to 5.4.5/6.1.0. It has been declared as critical. Affected by this vulnerability is some unknown functionality of the component com_users. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect integrity, and availability. The summary by CVE is:

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

The weakness was released by Christos Papakonstantinou and Cantina. It is possible to read the advisory at developer.joomla.org. This vulnerability is known as CVE-2026-48904 since 05/26/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/28/2026). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 5.4.6 or 6.1.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-1688). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Open Source Joomla

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: CMS 5.4.6/6.1.1

Timelineinfo

05/26/2026 Advisory disclosed
05/26/2026 +0 days CVE reserved
05/26/2026 +0 days VulDB entry created
05/28/2026 +1 days VulDB entry last update

Sourcesinfo

Vendor: joomla.org

Advisory: developer.joomla.org
Researcher: Christos Papakonstantinou, Cantina
Status: Confirmed

CVE: CVE-2026-48904 (🔒)
GCVE (CVE): GCVE-0-2026-48904
GCVE (VulDB): GCVE-100-365731
CERT Bund: WID-SEC-2026-1688 - Joomla: Mehrere Schwachstellen

Entryinfo

Created: 05/26/2026 19:50
Updated: 05/28/2026 01:29
Changes: 05/26/2026 19:50 (68), 05/26/2026 19:51 (1), 05/28/2026 01:29 (7)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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