CVE-2026-4334
Stored XSS in Shariff Wrapper WordPress Plugin
Publication date: 2026-05-28
Last updated on: 2026-05-28
Assigner: Wordfence
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| heise_online | shariff_wrapper | to 4.6.20 (inc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
The Shariff Wrapper plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in the 'headline' parameter of the [shariff] shortcode in all versions up to and including 4.6.20.
This vulnerability exists because the plugin does not properly sanitize input or escape output. It uses a custom wp_kses implementation with permissive allowed HTML tags and then performs a string replacement that injects HTML after sanitization.
As a result, authenticated users with Contributor-level access or higher can inject arbitrary web scripts into pages. These scripts execute whenever any user accesses the injected page.
How can this vulnerability impact me? :
This vulnerability allows attackers with Contributor-level access or above to inject malicious scripts into web pages.
When other users visit these pages, the injected scripts execute in their browsers, potentially leading to theft of sensitive information, session hijacking, or other malicious actions.
Because the attack requires authenticated access but no user interaction (UI:N), and the scope is changed (S:C), it can have a significant impact on confidentiality and integrity of data.