---
id: "CVE-2026-116866"
kind: "vulnerability"
aliases: ["CVE-2026-116866"]
title: "WooCommerce Extra Fees plugin: PHP object injection lets contributors run code"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "php", "woocommerce", "wordpress"]
not_affected_if: ["plugin-not-installed", "plugin-updated-past-4.4.0"]
published_at: "2026-10-29T16:18:01+00:00"
first_seen_at: "2026-10-29T16:25:57+00:00"
updated_at: "2026-10-29T16:29:12+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116866", "first_seen_at": "2026-10-29T16:25:57+00:00"}]
---

# WooCommerce Extra Fees plugin: PHP object injection lets contributors run code

The Extra Fees plugin for WooCommerce, versions 4.4.0 and older, unserializes untrusted PHP object data. An attacker with contributor-level access can use this to inject objects that may lead to code execution on the store.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Look up the installed Extra Fees for WooCommerce plugin version in the WordPress admin under Plugins.
- Confirm whether the plugin is active on the site.

## Fix

- Extra Fees for WooCommerce: move to a version newer than `4.4.0` (the sources do not name the fixed release).

## Timeline

- 2026-10-29T16:25:57+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116866

## From the sources

Contributor PHP Object Injection in Extra Fees Plugin for WooCommerce <= 4.4.0 versions.

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