Reported vulnerability

Real 3D Flipbook <= 5.1.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'lightboxtext' Shortcode Attribute

Published 18 Sept 2026

Updated 19 Sept 2026

CVE-2026-15098

Compare your installed software with the affected versions below. Follow the source’s remediation guidance and test an available update after taking a backup. A database entry describes a reported issue; it does not establish whether a particular website has been compromised.

Does this affect my version?

Check your installed version against this advisory. This compares the report’s version ranges and does not scan your website.

Wordfence advisory

medium · CVSS 6.4

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 block without the JSON_HEX_TAG flag, allowing a literal 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.

Severity vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Real3D Flipbook – 3D FlipBook, PDF FlipBook, PDF Viewer, PDF Embedder

Software: plugin · real3d-flipbook-lite
Affected versions: Start version unspecified, through 5.1.1
Fix availability: Fix available
Fixed versions: 5.1.2

Recommended action

Update to version 5.1.2, or a newer patched version

Further references (1)

wordfence.com/threat-intel/vulnerabilities/id/f6df3abe-ef27-46d7-bbdd-abd994fce132?source=api-prod

Data sources and licences

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CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

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Source: Wordfence

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Questions about this vulnerability

Which versions of Real3D Flipbook – 3D FlipBook, PDF FlipBook, PDF Viewer, PDF Embedder are affected?

Wordfence lists these affected versions: Start version unspecified, through 5.1.1. Use the version checker above to compare your installed release with this report.

Is a fix available for Real3D Flipbook – 3D FlipBook, PDF FlipBook, PDF Viewer, PDF Embedder?

Wordfence reports a fix for this issue in Real3D Flipbook – 3D FlipBook, PDF FlipBook, PDF Viewer, PDF Embedder. It lists these fixed versions: 5.1.2. Back up your website and test the recommended update before applying it to your live site.

Where can I find my installed plugin version?

In WordPress, open Plugins > Installed Plugins and find the version shown beneath the plugin name.

Does an affected version mean my website has been hacked?

An affected version means the installed release matches a vulnerability described in this report. It does not show whether anyone has exploited it on your website. The checker compares version numbers with stored reports; it does not inspect your website.

These reports cover at least one of the same plugins, themes or WordPress core. Check each report’s affected versions separately.

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