---
id: CVE-2026-15098
title: >-
  The Real3D Flipbook Lite plugin for WordPress is vulnerable to Stored
  Cross-Site Scripting via the 'lightboxtext' shortcode attribute (and other
  unsanitized attributes handled by on_shortcode()) in versions up to, and
  including, 5.1.1
summary: >-
  The Real3D Flipbook Lite plugin for WordPress is vulnerable to Stored
  Cross-Site Scripting via the 'lightboxtext' shortcode attribute (and other
  unsanitized attributes handled by on_shortcode()) in versions up to, and
  including, 5.1.1. T…
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: creativeinteractivemedia
product: 'Real3D Flipbook – 3D FlipBook, PDF FlipBook, PDF Viewer, PDF Embedder'
affected:
  - real3d_flipbook_3d_flipbook_pdf_flipbook_pdf_viewer_pdf_embedder <= 5.1.1
published: '2026-09-19'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T13:33:33.387'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-15098'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/real3d-flipbook-lite/tags/5.0/includes/Real3DFlipbook.php#L1224
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/real3d-flipbook-lite/tags/5.0/includes/Real3DFlipbook.php#L1468
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/real3d-flipbook-lite/tags/5.0/includes/Real3DFlipbook.php#L1668
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&old=3643539%40real3d-flipbook-lite&new=3643539%40real3d-flipbook-lite
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/f6df3abe-ef27-46d7-bbdd-abd994fce132?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
epss: 0.00193
epssPercentile: 0.09286
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-19T13:25:50.121711Z'
ingestedAt: '2026-09-19T07:59:56.104Z'
---

## Overview

The Real3D Flipbook Lite plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'lightboxtext' shortcode attribute (and other unsanitized attributes handled by on_shortcode()) in versions up to, and including, 5.1.1. This is due to insufficient input sanitization and output escaping in the on_shortcode() and print_global_options() functions: shortcode attribute values are copied verbatim into $this->flipbook_options and then emitted via wp_json_encode() inside a <script type="application/json"> block without the JSON_HEX_TAG flag, allowing a literal </script> byte sequence in the attribute value to break out of the JSON script context. Because WordPress's shortcode_parse_atts() applies stripcslashes() to attribute values, an attacker can encode the breakout tag as \x3c/script\x3e\x3cscript\x3e…\x3c/script\x3e, which survives the wp_kses_post save-time filter applied to Contributor content (the escape bytes are safe text characters, not HTML tags) and is decoded to real angle brackets at render time. 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 (typically an Editor or Administrator previewing/moderating the pending post) accesses an injected page.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.