---
id: "CVE-2026-107711"
kind: "vulnerability"
aliases: ["CVE-2026-107711"]
title: "FlexStock WooCommerce plugin: stored script injection by any subscriber"
severity: "medium"
cvss: 6.4
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["flexstock", "package", "self-hosted", "woocommerce", "wordpress"]
not_affected_if: ["no-open-registration", "plugin-not-installed", "version-above-3.17.2"]
published_at: "2026-10-31T10:16:37+00:00"
first_seen_at: "2026-10-31T10:34:55+00:00"
updated_at: "2026-10-31T10:36:04+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-107711", "first_seen_at": "2026-10-31T10:34:55+00:00"}]
---

# FlexStock WooCommerce plugin: stored script injection by any subscriber

The FlexStock plugin for WordPress and WooCommerce stores attacker-supplied content in product pages without escaping it, so scripts run in the browser of anyone who opens the injected page. Any logged-in Subscriber-level user can plant the script because the REST bearer token is exposed in the dashboard and the endpoint checks only that token, not capabilities.

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

## How to check

- Check whether the FlexStock plugin is installed and its version in the WordPress admin plugin list, or `wp plugin get flexstock-product-stock-sync --field=version` if the slug is confirmed
- Confirm the installed version is `3.17.2` or lower
- Review whether subscriber-level accounts can register on the site

## Timeline

- 2026-10-31T10:34:55+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-107711

## From the sources

The FlexStock – Product Stock Sync with Google Sheets for WooCommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'products[].post_content' parameter in all versions up to, and including, 3.17.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is exploitable by any Subscriber-level user because the plugin's admin_enqueue_scripts callback exposes the REST bearer token in the Dashboard page source via wp_localize_script() without a capability check, and the REST endpoint's permission_callback validates only that bearer token rather than performing a current_user_can() capability check.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_