# CVE-2026-65883: Joomla Extension - aimy-extensions.com - RCE via PHP object injection in Aimy Captcha-Less Form Guard 18.0 - 20.0

> Attackers can achieve remote code execution by injecting PHP objects via a forged field in the Aimy Captcha-Less Form Guard plugin.

- **Severity:** Critical 10.0 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Jul 2026
- **Updated:** 29 Jul 2026
- **Also known as:** GHSA-4f62-78r3-84fq

## What is CVE-2026-65883?

CVE-2026-65883 is a critical unsafe deserialization vulnerability in aimy-extensions.com Aimy Captcha-Less Form Guard plugin for Joomla, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

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.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2026-65883?

It affects 1 product.


Products: Aimy-Extensions Aimy Captcha-Less Form Guard.

## How do I fix CVE-2026-65883?

No fix has been published for CVE-2026-65883 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-65883 being exploited?

There is no known exploitation of CVE-2026-65883 in the wild and no public exploit code.

Public exploit code:

- Aimy Captcha-Less Form Guard Joomla Component PHP Object Injection RCE. clfgd XOR keystream recovery + unserialize(). CVSS 10.0 | CWE-502 | aimy_captcha-less_form_guard < 20.1 (github_poc): https://github.com/shinthink/CVE-2026-65883

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-65883 and fix it if it is affected.

What it is: CVE-2026-65883 is a critical unsafe deserialization vulnerability in aimy-extensions.com Aimy Captcha-Less Form Guard plugin for Joomla, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-65883 in the wild and no public exploit code.

Affected product: aimy-extensions.com Aimy Captcha-Less Form Guard plugin for Joomla. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-65883/ (Markdown: https://insights.sbomify.com/CVE-2026-65883/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-65883
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-65883
- OSV: https://osv.dev/vulnerability/CVE-2026-65883

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-65883/
Summaries are generated and may contain mistakes; the official description above is the record.