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Fabrik EUVDEUVD-2026-64320

| CVE-2026-76604 CRITICAL
Code Injection (CWE-94)
2026-08-22 Joomla GHSA-fq44-8wg9-5qfj
PHP Code Injection RCE Fabrik Extension For Joomla
10.0
CVSS 4.0 · Vendor: Joomla
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Severity by source

Vendor (Joomla) PRIMARY
10.0 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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
10.0 CRITICAL

Unauthenticated network PHP code injection (PR:N/AV:N/AC:L) executing in the web-server context escapes the extension boundary to the host, so S:C with full C/I/A impact.

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

Primary rating from Vendor (Joomla).

CVSS VectorVendor: Joomla

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 22, 2026 - 15:11 vuln.today
CVE Published
Aug 22, 2026 - 14:18 cve.org
CRITICAL 10.0

DescriptionCVE.org

Joomla Extension - fabrikar.com - Unauthenticated remote code execution via PHP form element in Fabrik < 4.7.3 - The PHP form element is vulnerable to the execution of user provided codes.

Articles & Coverage 1

News Critical RCE in Joomla Fabrik Extension (≤4.7.2) - CVE-2026-76604 Aug 22, 2026

AnalysisAI

Remote code execution in the Fabrik extension for Joomla (all versions 1.0.0 through 4.7.2) allows unauthenticated attackers to run arbitrary PHP through the extension's PHP form element, which evaluates user-supplied code. Rated CVSS 10.0 with a network, no-privileges, no-interaction vector and full confidentiality/integrity/availability impact including scope change, this yields complete compromise of the underlying Joomla host. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Locate Joomla site with Fabrik
Delivery
Identify reachable PHP form element
Exploit
Submit crafted PHP payload
Execution
Extension evaluates code server-side
Persist
Execute arbitrary code as web user
Impact
Deploy web shell / pivot
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target Joomla installation has the Fabrik extension (version 1.0.0-4.7.2) installed and that a form using Fabrik's PHP form element is reachable by the attacker; that PHP element is the exact feature that evaluates user-supplied code. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine top-priority issue, not an inflated high-CVSS score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker locates a public Joomla site running a vulnerable Fabrik version that exposes a form built with the PHP form element, then submits a request containing crafted PHP in the targeted field. The extension evaluates the input server-side, executing the attacker's code as the web-server user and giving an unauthenticated foothold that can be escalated to a full web shell. …
Remediation Upgrade the Fabrik extension to version 4.7.3 or later, which is the vendor-released fix boundary indicated by the 'Fabrik < 4.7.3' advisory; obtain the update from the vendor at https://www.fabrikar.com/. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify all Joomla instances running Fabrik extension (versions 1.0.0-4.7.2) and disable or uninstall the extension immediately if not critical to operations; document any systems where removal is not feasible. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-64320 vulnerability details – vuln.today
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