CVE-2026-8623 Details
Description
The Dear Flipbook – PDF Flipbook, 3D Flipbook, PDF embed, PDF viewer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'post_content (class attribute of .dvcss element)' parameter in all versions up to, and including, 2.4.30 due to insufficient input sanitization and output escaping. 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. The payload is embedded as a Base64-encoded JSON object in a CSS class name on a Custom HTML block; the frontend parseCSSElements() function decodes it client-side with atob() and JSON.parse() and renders the logo property as raw HTML, meaning no server-side or client-side sanitization intercepts the malicious script before DOM insertion.
A stored cross-site scripting vulnerability has been identified in the Dear Flipbook WordPress plugin, specifically in versions through 2.4.30. This vulnerability allows authenticated attackers with contributor-level access or higher to inject arbitrary web scripts into pages. The issue arises from inadequate input sanitization and output escaping, particularly through the 'post_content' parameter, which is processed as a class attribute of the '.dvcss' element. Exploitation involves embedding a Base64-encoded JSON object into a CSS class name within a Custom HTML block. The frontend 'parseCSSElements()' function then decodes and executes the script as raw HTML, bypassing any necessary sanitization before it is inserted into the DOM.
Users are advised to update the Dear Flipbook WordPress plugin to version 2.4.37 or a newer patched version.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 5, 2026CISA-ADP
Assessed Sep 7, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Dear Flipbook | <= 2.4.30 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 7, 2026 | CVE Modified | CISA-ADP |
| Sep 5, 2026 | New CVE Received | [email protected] |