The Auto Thumbnail plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'thumbnails' shortcode in all versions up to, and including, 1.0. This is due to insufficient input sanitization and output escaping on the shortcode's 'width' and 'height' attributes in the athn_thumbnails() function, which are concatenated directly into an HTML <img> tag. 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.
Metrics
Affected Vendors & Products
References
History
Wed, 27 May 2026 13:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Wed, 27 May 2026 10:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Gapgag55
Gapgag55 auto Thumbnails Wordpress Wordpress wordpress |
|
| Vendors & Products |
Gapgag55
Gapgag55 auto Thumbnails Wordpress Wordpress wordpress |
Wed, 27 May 2026 06:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | The Auto Thumbnail plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'thumbnails' shortcode in all versions up to, and including, 1.0. This is due to insufficient input sanitization and output escaping on the shortcode's 'width' and 'height' attributes in the athn_thumbnails() function, which are concatenated directly into an HTML <img> tag. 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. | |
| Title | Auto Thumbnails <= 1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes | |
| Weaknesses | CWE-79 | |
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: Wordfence
Published: 2026-05-27T05:31:33.290Z
Updated: 2026-05-27T10:31:31.086Z
Reserved: 2026-05-18T21:10:59.140Z
Link: CVE-2026-8899
Updated: 2026-05-27T10:31:26.011Z
Status : Received
Published: 2026-05-27T07:16:18.083
Modified: 2026-05-27T07:16:18.083
Link: CVE-2026-8899
No data.