Reported vulnerability

3D FlipBook <= 1.16.20 - Unauthenticated Sensitive Information Exposure in 'id' Parameter

Q: Which versions of 3D FlipBook – PDF Embedder, PDF Flipbook Viewer, Flipbook Image Gallery are affected?

Wordfence lists these affected versions: Start version unspecified, through 1.16.20. Use the version checker above to compare your installed release with this report.

Q: Is a fix available for 3D FlipBook – PDF Embedder, PDF Flipbook Viewer, Flipbook Image Gallery?

Wordfence reports a fix for this issue in 3D FlipBook – PDF Embedder, PDF Flipbook Viewer, Flipbook Image Gallery. It lists these fixed versions: 1.16.21. Back up your website and test the recommended update before applying it to your live site.

Q: Where can I find my installed plugin version?

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

Published 14 Sept 2026

Updated 15 Sept 2026

CVE-2026-15758

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 5.3

The 3D FlipBook – PDF Embedder, PDF Flipbook Viewer, Flipbook Image Gallery plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 1.16.20 via the 'id' parameter. This makes it possible for unauthenticated attackers to extract sensitive data including the full metadata payload of password-protected flipbooks — including title, outline, props, and the serialized data blob containing the underlying PDF file's direct URL — bypassing WordPress post-password confidentiality. Flipbook post IDs can be pre-enumerated via the also-unauthenticated fb3d_send_posts AJAX action, requiring no prior knowledge to target specific flipbooks.

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

3D FlipBook – PDF Embedder, PDF Flipbook Viewer, Flipbook Image Gallery

Software: plugin · interactive-3d-flipbook-powered-physics-engine
Affected versions: Start version unspecified, through 1.16.20
Fix availability: Fix available
Fixed versions: 1.16.21

Recommended action

Update to version 1.16.21, or a newer patched version

Further references (1)

wordfence.com/threat-intel/vulnerabilities/id/3ad65e10-6f99-421b-abec-ed374769dfcf?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.

Read licence terms

Source: Wordfence

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Questions about this vulnerability

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

Wordfence lists these affected versions: Start version unspecified, through 1.16.20. Use the version checker above to compare your installed release with this report.

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

Wordfence reports a fix for this issue in 3D FlipBook – PDF Embedder, PDF Flipbook Viewer, Flipbook Image Gallery. It lists these fixed versions: 1.16.21. 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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