# Real3D Flipbook – 3D FlipBook, PDF FlipBook, PDF Viewer, PDF Embedder <= 5.5 - Unauthenticated DOM-Based Cross-Site Scripting via 'r3d-' URL Parameters

- **ID:** WPSEC-2026-0912
- **Plugin:** Real3D Flipbook – 3D FlipBook, PDF FlipBook, PDF Viewer, PDF Embedder (`real3d-flipbook-lite`), https://wordpress.org/plugins/real3d-flipbook-lite/
- **Affected versions:** all versions before 5.7
- **Fixed in:** 5.7 (Update to 5.7 or later.)
- **Severity:** Medium 6.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-10-14)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/real3d-flipbook-lite
- **Fix released:** 2026-10-13
- **Published:** 2026-10-14
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0912/

## Description

The Real3D Flipbook plugin for WordPress is vulnerable to DOM-Based Cross-Site Scripting via 'r3d-' prefixed URL parameters in all versions up to, and including, 5.5. This is due to the front-end embed script copying any 'r3d-<option>' query parameter into the flipbook options without validation, so HTML-bearing options reach innerHTML sinks in the viewer. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute when they trick a user into opening a crafted link to a page containing a flipbook.

## References

- https://wpsec.com/vuln/WPSEC-2026-0912/
- https://plugins.svn.wordpress.org/real3d-flipbook-lite/tags/5.7/
- https://wordpress.org/plugins/real3d-flipbook-lite/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0912/

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.