---
id: "CVE-2012-20003"
kind: "vulnerability"
aliases: ["CVE-2012-20003"]
title: "Custom Tables WordPress plugin: reflected script injection steals visitor cookies"
severity: "medium"
cvss: 6.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["custom-tables-plugin", "package", "self-hosted", "wordpress"]
not_affected_if: ["plugin-3.4.6-or-later", "plugin-not-installed"]
published_at: "2026-10-20T21:17:11+00:00"
first_seen_at: "2026-10-23T21:57:21+00:00"
updated_at: "2026-10-25T04:04:05+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2012-20003", "first_seen_at": "2026-10-23T21:57:21+00:00"}]
---

# Custom Tables WordPress plugin: reflected script injection steals visitor cookies

The Custom Tables plugin for WordPress before 3.4.6 does not sanitize the 'key' parameter in iframe.php, so a crafted link runs script in the victim's browser. An attacker can use it to steal cookies, and no login is needed to send the link.

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

## How to check

- Check the installed Custom Tables plugin version in the WordPress admin under Plugins, or in `wp-content/plugins/custom-tables/` style headers
- Confirm whether `wp-content/plugins/custom-tables/iframe.php` exists on the site

## Fix

- Update the Custom Tables plugin to `3.4.6` or later
- If the plugin cannot be updated, remove it or block access to `iframe.php`

## Timeline

- 2026-10-23T21:57:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2012-20003

## From the sources

Custom Tables plugin for WordPress before 3.4.6 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject scripts through the unsanitized 'key' parameter in iframe.php. Attackers can craft GET requests to /wp-content/plugins/custom-tables/iframe.php with s=1 and a malicious key value to execute script in victims' browsers and steal cookies. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-20.

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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_