> For the complete documentation index, see [llms.txt](https://docs.ionos.com/cloud/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ionos.com/cloud/home/security-safeguards/vulnerability-register/2026/php2shell-vulnerability.md).

# Advisory on PHP2Shell Vulnerability

On October 21, 2026, PHP disclosed two vulnerabilities in its core code that allow remote code execution on affected servers.

These vulnerabilities, known collectively as PHP2Shell, allow an attacker to run code on a server running PHP. Exploitation may be possible without authentication.

These vulnerabilities are classified as **Critical** severity with the following CVSS scores:

| CVE ID                                                                                               | CVSS Score |
| ---------------------------------------------------------------------------------------------------- | :--------: |
| [<mark style="color:blue;">CVE-2026-109618</mark>](https://nvd.nist.gov/vuln/detail/CVE-2026-109618) |     9.2    |
| [<mark style="color:blue;">CVE-2026-109619</mark>](https://nvd.nist.gov/vuln/detail/CVE-2026-109619) |     9.2    |

## Impacted IONOS CLOUD products

<code class="expression">space.vars.ionos\_cloud</code> infrastructure and services do not use the vulnerable software and are not impacted.

## Risk on IONOS CLOUD user environment

Servers that you manage and that run an affected PHP version, such as virtual machines with a self-installed PHP or Plesk, are at risk of remote code execution. You are responsible for patching software that you install and operate.

## What action has IONOS CLOUD taken to mitigate the vulnerability?

No action is required for <code class="expression">space.vars.ionos\_cloud</code> infrastructure and services, because they do not use the vulnerable software.

## What action can you take to mitigate the vulnerability?

* Update PHP to version 8.2.35, 8.3.36, 8.4.27, 8.5.12, or later, or install the fixed packages from your operating system distribution.
* If you use Plesk, install Plesk Obsidian 18.0.81 Update 4 or 18.0.80 Update 11 or later.
* PHP 8.1 and older versions do not receive fixes for these vulnerabilities. Upgrade to a supported PHP version.

## How can I get help?

If you have further questions or concerns about this vulnerability, contact [<mark style="color:blue;">IONOS CLOUD Support</mark>](https://docs.ionos.com/support/general-information/contact-information).


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