CVE-2026-65883Public exploitNetwork attack vector

Unauthenticated code execution via clfgd object injection

Published Jul 29, 2026 · Updated Jul 29, 2026

PHP object injection in Aimy Captcha-Less Form Guard 18.0 through 20.0 allows remote attackers to execute code via a forged clfgd field. The plugin deserializes attacker-controlled PHP object data supplied in clfgd rather than rejecting the forged field. No authentication or user interaction is required, and successful exploitation executes code in the Joomla site's server context.

CVSS severity10.0
Critical
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PHP object injection in Aimy Captcha-Less Form Guard 18.0 through 20.0 allows remote attackers to execute code via a forged clfgd field. The plugin deserializes attacker-controlled PHP object data supplied in clfgd rather than rejecting the forged field. No authentication or user interaction is required, and successful exploitation executes code in the Joomla site's server context.

The record

CVE
CVE-2026-65883
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
Aimy Extensions
Product
Aimy Captcha-Less Form Guard
Classifications
CWE-502, CAPEC-586, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=18.0-20.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Aimy Extensions · Aimy Captcha-Less Form Guardversion=18.0-20.0

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0Joomla! ProjectCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CAPEC-586Object Injection
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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