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CVE-2026-8623— Dear Flipbook <= 2.4.30 - Authenticated (Contributor+) Stored Cross-Site Scripting via '.dvcss' Element Class Attribute

Quick assessment

Affected
dearhive DearFlip – PDF Flipbook, 3D Flipbook, PDF embed, PDF viewer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 的 The Dear Flipbook 插件（PDF 翻页书、3D 翻页书、PDF 嵌入、PDF 查看器）在所有版本中（包括 2.4.30 及以下版本）存在存储型跨站脚本（Stored XSS）漏洞。该漏洞由输入净化不足和输出转义缺失导致，受影响参数为“post_content（.dvcss 元素的 class 属性）”。 这意味着拥有贡献者（contributor）或更高权限的已认证攻击者，可以注入任意 Web 脚本到页面中；当用户访问被注入的页面时，这些脚本将会执行。攻击载荷以 Base64

CVSS 6.4 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-8623

Vulnerability Information
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Vulnerability Title
Dear Flipbook <= 2.4.30 - Authenticated (Contributor+) Stored Cross-Site Scripting via '.dvcss' Element Class Attribute
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
dearhive DearFlip – PDF Flipbook, 3D Flipbook, PDF embed, PDF viewer 0 ~ 2.4.30 -

II. Public POCs for CVE-2026-8623

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III. Intelligence Information for CVE-2026-8623

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Other References for CVE-2026-8623 (6)

IV. Related Vulnerabilities

Same product: DearFlip – PDF Flipbook, 3D Flipbook, PDF embed, PDF viewer
Same vendor: dearhive
Same weakness: CWE-79

V. Comments for CVE-2026-8623

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