CVE-2026-8899
Stored XSS in Auto Thumbnail WordPress Plugin
Publication date: 2026-05-27
Last updated on: 2026-05-27
Assigner: Wordfence
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| wordfence | auto_thumbnail | to 1.0 (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 Auto Thumbnail plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in all versions up to and including 1.0. This vulnerability arises because the plugin does not properly sanitize or escape input for the 'width' and 'height' attributes in the 'thumbnails' shortcode. These attributes are directly inserted into an HTML <img> tag, allowing authenticated users with contributor-level access or higher to inject malicious scripts. These scripts then execute whenever any user views the affected page.
How can this vulnerability impact me? :
This vulnerability can allow attackers with contributor-level access to inject arbitrary web scripts into pages. When other users access these pages, the malicious scripts execute in their browsers. This can lead to theft of user credentials, session hijacking, defacement of the website, or distribution of malware, compromising both site integrity and user security.