CVE-2026-8891
Deferred Deferred - Pending Action
Stored Cross-Site Scripting in BitForm WordPress Plugin

Publication date: 2026-05-27

Last updated on: 2026-05-27

Assigner: Wordfence

Description
The BitForm plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'bitform' shortcode in versions up to, and including, 1.1.0. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes ('width' and 'height') in the Shortcode::shortcode() function, which are interpolated directly into the 'style' attribute of an <iframe> element. 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.
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Meta Information
Published
2026-05-27
Last Modified
2026-05-27
Generated
2026-06-16
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-8891
EUVD
EUVD-2026-32077
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
bitform bitform to 1.1.0 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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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.
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Impact Analysis

This vulnerability allows attackers with contributor-level access to inject arbitrary scripts into pages, which can lead to the execution of malicious code in the browsers of users who visit those pages. This can result in theft of sensitive information, session hijacking, defacement of the website, or distribution of malware.

Executive Summary

The BitForm plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in its 'bitform' shortcode up to version 1.1.0. This occurs because the plugin does not properly sanitize or escape user-supplied attributes 'width' and 'height' that are used directly in the style attribute of an iframe element. As a result, authenticated users with contributor-level access or higher can inject malicious scripts that execute whenever someone views the affected page.

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