Dear Flipbook <= 2.4.30 - Authenticated (Contributor+) Stored Cross-Site Scripting via '.dvcss' Element Class Attribute
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-8623
- 2026-10-03 Alias added: GHSA-35hh-c4h4-vp3q
References
Other 6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/27e2848d-6271-4bb9-92e2-0f8c8860745d?source=cve
- https://plugins.trac.wordpress.org/browser/3d-flipbook-dflip-lite/tags/2.4.27/assets/js/dflip.js#L11255
- https://plugins.trac.wordpress.org/browser/3d-flipbook-dflip-lite/tags/2.4.27/assets/js/dflip.js#L2687
- https://plugins.trac.wordpress.org/changeset?reponame=&new=3641463%403d-flipbook-dflip-lite%2Ftags%2F2.4.37&old=3557511%403d-flipbook-dflip-lite%2Ftags%2F2.4.30
- https://plugins.trac.wordpress.org/changeset/3641463/3d-flipbook-dflip-lite/trunk/assets/js/dflip.js
- https://plugins.trac.wordpress.org/changeset?old_path=%2F3d-flipbook-dflip-lite/tags/2.4.30&new_path=%2F3d-flipbook-dflip-lite/tags/2.4.37
More dearhive vulnerabilities
- TI-2024-19583 WordPress DearFlip plugin <= 2.2.26 - Cross Site Scripting (XSS) vulnerability CVSS 3.1MEDIUM 6.5
- TI-2024-15547 WordPress PDF Viewer & 3D PDF Flipbook – DearPDF Plugin <= 2.0.38 is vulnerable to Cross Site Scripting (XSS) CVSS 3.1MEDIUM 6.5
- TI-2026-07581 Dear Flipbook <= 2.4.30 - Authenticated (Contributor+) Stored Cross-Site Scripting via '.df-element' Element Inner HTML CVSS 3.1MEDIUM 6.4
- TI-2026-02195 Dear Flipbook <= 2.4.20 - Authenticated (Auhtor+) Stored Cross-Site Scripting via PDF Page Labels CVSS 3.1MEDIUM 6.4
- TI-2024-10974 Cross-site scripting in dearhive Dear Flipbook – PDF Flipbook, 3D Flipbook, PDF embed… CVSS 3.1MEDIUM 6.4
- TI-2024-08086 PDF Flipbook, 3D Flipbook, PDF embed, PDF viewer – DearFlip <= 2.3.32 - Reflected Cross-Site Scripting CVSS 3.1MEDIUM 6.1
Sources
- CVE-2026-8623 · CVE Program
- CVE-2026-8623 · NVD
- FIRST EPSS
- GHSA-35hh-c4h4-vp3q · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences