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Joomla! CMS EUVDEUVD-2026-42068

| CVE-2026-48958 MEDIUM
Improper Access Control (CWE-284)
2026-07-07 Joomla GHSA-c3p9-2r8w-w7xv
Authentication Bypass Joomla Cms
6.4
CVSS 4.0 · Vendor: Joomla
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Severity by source

Vendor (Joomla) PRIMARY
6.4 MEDIUM
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.0 MEDIUM

Network REST endpoint, low complexity; PR:L reflects authenticated-but-lower-than-required access per Authentication Bypass tag; scope change acknowledged but direct confidentiality impact is absent.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
4.0 AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (Joomla).

CVSS VectorVendor: Joomla

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
Jul 07, 2026 - 18:52 vuln.today

DescriptionCVE.org

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

AnalysisAI

Incorrect access control in Joomla! CMS exposes com_fields REST API webservices endpoints to users who lack the required permissions, allowing them to create custom field definitions that should be restricted to higher-privileged roles such as Manager or Administrator. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to Joomla instance
Delivery
Send crafted POST to /api/index.php/v1/fields
Exploit
Bypass missing ACL check in com_fields webservice handler
Execution
Create unauthorized custom field definition
Impact
Malicious field content rendered to site visitors or administrators
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Vulnerability AssessmentAI

Exploitation The Joomla REST API must be active, which requires the plg_webservices_fields plugin to be enabled - this is not the default state on all Joomla installations and requires deliberate activation. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The vendor-assigned CVSS 4.0 score of 6.4 reflects a medium base severity, but the subsequent-system impact triad of SC:H/SI:H/SA:H in the provided vector indicates that malicious custom field definitions, once created, could propagate significant harm to rendered site content and downstream integrations. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated Joomla user holding a role below Manager or Administrator sends a crafted POST request to /api/index.php/v1/fields, bypassing the missing or flawed ACL check in the com_fields webservices handler. The attacker creates custom field definitions containing malicious markup or template injection payloads that are subsequently rendered across site content, affecting page integrity for all visitors and potentially targeting administrator sessions.
Remediation Upgrade to the patched Joomla! … Detailed patch versions, workarounds, and compensating controls in full report.
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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-42068 vulnerability details – vuln.today
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