bitform BitForm Plugin up to 1.1.0 on WordPress Shortcode Shortcode::shortcode style cross site scripting

Summaryinfo

A vulnerability classified as problematic has been found in bitform BitForm Plugin up to 1.1.0 on WordPress. This affects the function Shortcode::shortcode of the component Shortcode Handler. This manipulation of the argument style causes cross site scripting. This vulnerability is tracked as CVE-2026-8891. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in bitform BitForm Plugin up to 1.1.0 on WordPress and classified as problematic. Affected by this vulnerability is the function Shortcode::shortcode of the component Shortcode Handler. The manipulation of the argument style with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity. The summary by CVE is:

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 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.

The weakness was disclosed by Muhammad Yudha. The advisory is shared at wordfence.com. This vulnerability is known as CVE-2026-8891 since 05/18/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• WordPress Plugin

Vendor

• bitform

Name

• BitForm Plugin

Version

• 1.0
• 1.1.0

CPE 2.3info

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CPE 2.2info

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Entryinfo

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