CVE-2026-8891: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in bitform BitForm – Data management solution for WordPress
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.
AI Analysis
Technical Summary
The BitForm plugin for WordPress versions up to 1.1.0 contains a stored cross-site scripting vulnerability (CWE-79) due to insufficient input sanitization and output escaping in the Shortcode::shortcode() function. Specifically, the 'width' and 'height' shortcode attributes are interpolated directly into the style attribute of an iframe element without proper neutralization. This allows authenticated users with contributor-level permissions or higher to inject arbitrary JavaScript code that executes in the context of any user viewing the affected page. The vulnerability is tracked as CVE-2026-8891 with a CVSS 3.1 score of 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N). No patch or official remediation has been published by the vendor as of the provided data.
Potential Impact
Successful exploitation allows an authenticated contributor or higher to inject persistent malicious scripts into pages via the BitForm shortcode attributes. These scripts execute in the browsers of users who view the infected pages, potentially leading to information disclosure and integrity impacts within the affected site context. Availability is not impacted. There are no known active exploits in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict contributor-level access to trusted users only and consider disabling or removing the BitForm plugin if feasible. Monitor vendor channels for updates and apply patches promptly once available.
CVE-2026-8891: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in bitform BitForm – Data management solution for WordPress
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.
CVSS v3.1
Score 6.4medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The BitForm plugin for WordPress versions up to 1.1.0 contains a stored cross-site scripting vulnerability (CWE-79) due to insufficient input sanitization and output escaping in the Shortcode::shortcode() function. Specifically, the 'width' and 'height' shortcode attributes are interpolated directly into the style attribute of an iframe element without proper neutralization. This allows authenticated users with contributor-level permissions or higher to inject arbitrary JavaScript code that executes in the context of any user viewing the affected page. The vulnerability is tracked as CVE-2026-8891 with a CVSS 3.1 score of 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N). No patch or official remediation has been published by the vendor as of the provided data.
Potential Impact
Successful exploitation allows an authenticated contributor or higher to inject persistent malicious scripts into pages via the BitForm shortcode attributes. These scripts execute in the browsers of users who view the infected pages, potentially leading to information disclosure and integrity impacts within the affected site context. Availability is not impacted. There are no known active exploits in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict contributor-level access to trusted users only and consider disabling or removing the BitForm plugin if feasible. Monitor vendor channels for updates and apply patches promptly once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-05-18T20:50:09.614Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a169066e29bf47b509e17ec
Added to database: 5/27/2026, 6:34:14 AM
Last enriched: 5/27/2026, 6:49:35 AM
Last updated: 5/29/2026, 9:31:25 AM
Views: 10
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.