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Aimy Form Guard CVE-2026-65883

| EUVDEUVD-2026-50275 CRITICAL
Deserialization of Untrusted Data (CWE-502)
2026-07-29 Joomla GHSA-4f62-78r3-84fq
PHP RCE Deserialization Aimy Captcha Less Form Guard Plugin 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-reachable deserialization RCE (AV:N/AC:L/PR:N/UI:N) with code execution escaping the app to the host, so S:C and 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
Jul 29, 2026 - 10:52 vuln.today
CVE Published
Jul 29, 2026 - 09:34 cve.org
CRITICAL 10.0

DescriptionCVE.org

Joomla Extension - aimy-extensions.com - RCE via PHP object injection in Aimy Captcha-Less Form Guard 18.0 - 20.0 - A forged clfgd field allows PHP objection injection and thereby remote code execution.

Articles & Coverage 1

News Critical RCE in Joomla Aimy Captcha-Less Form Guard Plugin - CVE-2026-65883 Jul 30, 2026

AnalysisAI

Remote code execution in the Aimy Captcha-Less Form Guard plugin for Joomla (versions 18.0 through 20.0) allows unauthenticated attackers to run arbitrary PHP by submitting a forged 'clfgd' form field that the plugin deserializes, triggering PHP object injection. Any unpatched Joomla site running this plugin is exposed to full server compromise over the network without authentication or user interaction. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify Joomla site with plugin active
Delivery
Craft serialized PHP object in clfgd field
Exploit
Submit forged form POST
Execution
Plugin deserializes untrusted input
Persist
Magic-method POP chain triggers
Impact
Execute arbitrary code on server
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the Aimy Captcha-Less Form Guard plugin (version 18.0-20.0) is installed and active on a network-reachable Joomla site, and that the attacker can submit a request containing a forged 'clfgd' field carrying a serialized PHP object. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment All available signals point to genuine high priority. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker locates a public Joomla site running Aimy Captcha-Less Form Guard 18.0-20.0, then submits a normal-looking form POST in which the 'clfgd' field is replaced with a crafted serialized PHP object payload. The plugin deserializes the value, instantiating attacker-chosen objects whose magic methods fire a gadget chain, resulting in arbitrary PHP/command execution on the web server. …
Remediation No vendor-released patch version is identified in the available data, so verify fix availability directly at the vendor page https://www.aimy-extensions.com/joomla/captcha-less-form-guard.html and upgrade to any release later than 20.0 once published. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Joomla installations to identify any running versions 18.0-20.0 of the Aimy Captcha-Less Form Guard plugin and immediately disable or uninstall the affected plugin. …

Sign in for detailed remediation steps and compensating controls.

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

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CVE-2026-65883 vulnerability details – vuln.today
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