# Strong Testimonials <= 3.3.15 - Authenticated (Contributor+) Stored Cross-Site Scripting via testimonial_view Shortcode Attributes

- **ID:** WPSEC-2026-1840
- **Plugin:** Strong Testimonials (`strong-testimonials`), https://wordpress.org/plugins/strong-testimonials/
- **Affected versions:** all versions before 3.3.16
- **Fixed in:** 3.3.16 (Update to 3.3.16 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 2026-10-28)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/strong-testimonials
- **Fix released:** 2026-10-27
- **Published:** 2026-10-28
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1840/

## Description

The Strong Testimonials plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the testimonial_view shortcode's attributes in all versions up to, and including, 3.3.15, due to insufficient input sanitization and output escaping. User-supplied shortcode attributes could override the internal 'view_not_found' flag, so a view that failed validation was still rendered with an attacker-controlled 'view' value. In slideshow mode that value was concatenated unescaped into a JavaScript variable name printed in an inline script. The 'thumbnail_width' and 'thumbnail_height' attributes were also placed unescaped into image tag attributes for imported review thumbnails. 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 an injected page.

## References

- https://wpsec.com/vuln/WPSEC-2026-1840/
- https://plugins.svn.wordpress.org/strong-testimonials/tags/3.3.16/
- https://wordpress.org/plugins/strong-testimonials/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1840/

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.