# Interactive Content – H5P <= 1.17.9 - Authenticated (Contributor+) Stored Cross-Site Scripting via Content Tags

- **ID:** WPSEC-2026-1327
- **Plugin:** Interactive Content – H5P (`h5p`), https://wordpress.org/plugins/h5p/
- **Affected versions:** all versions before 1.17.10
- **Fixed in:** 1.17.10 (Update to 1.17.10 or later.)
- **Severity:** Medium 6.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-10-21)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/h5p
- **Fix released:** 2026-10-20
- **Published:** 2026-10-21
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1327/

## Description

The Interactive Content – H5P plugin for WordPress is vulnerable to Stored Cross-Site Scripting via H5P content tags in all versions up to, and including, 1.17.9, due to insufficient input sanitization of tag names containing the ';' delimiter and insufficient output escaping of the tag identifier when the content list builds facet attributes. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts that will execute whenever a user, such as an administrator, views the H5P content listing in the dashboard.

## References

- https://wpsec.com/vuln/WPSEC-2026-1327/
- https://plugins.svn.wordpress.org/h5p/tags/1.17.10/
- https://wordpress.org/plugins/h5p/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1327/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.