# CVE-2026-101921: WPForms plugin reflected cross-site scripting in smart tags

Source: https://junglewise.ai/threats/cve-2026-101921-the-wpforms-ai-form-builder-for-wordpress-contact-forms-payment  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-10. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-101921 · Severity: medium · CVSS 4.7 · Published 2026-10-10

WPForms is a WordPress plugin that allows site administrators to create contact forms, payment forms, surveys, and quizzes. The plugin is vulnerable to reflected cross-site scripting (XSS) attacks when a form description contains a smart tag query variable displayed in an iframe. An attacker can craft a malicious link and trick users into clicking it, causing arbitrary scripts to execute in their browsers and potentially steal session data or perform unauthorized actions.

Technologies: [WPForms](https://junglewise.ai/threats/technologies/wpforms). Vendors: [WPForms](https://junglewise.ai/threats/vendors/wpforms).

## Quick answers

**Is CVE-2026-101921 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101921 being exploited in the wild.

**How severe is CVE-2026-101921?** Medium severity, with a CVSS score of 4.7, published 10 October 2026.

**Which products and versions are affected?** WPForms up to and including 2.0.2.1.

**Is there a fix for CVE-2026-101921?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-101921 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-101921?** Check whether you run WPForms at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a reflected XSS flaw in the QueryVar smart tag handler due to insufficient input sanitization and output escaping of attacker-controlled query string parameters. The attack requires that a site administrator has previously saved a form with a {query_var} smart tag embedded in an iframe srcdoc attribute and enabled the form description on a public-facing page. Unauthenticated attackers can inject arbitrary HTML and JavaScript by crafting a malicious URL that will execute in the context of the victim's browser session.

## Affected products

- WPForms WPForms up to and including 2.0.2.1

## Timeline

- 2026-10-10: disclosed

## References

- [https://plugins.trac.wordpress.org/browser/wpforms-lite/tags/2.0.2.1/src/Frontend/Classic.php](https://plugins.trac.wordpress.org/browser/wpforms-lite/tags/2.0.2.1/src/Frontend/Classic.php)
- [https://plugins.trac.wordpress.org/browser/wpforms-lite/tags/2.0.2.1/src/SmartTags/SmartTag/QueryVar.php](https://plugins.trac.wordpress.org/browser/wpforms-lite/tags/2.0.2.1/src/SmartTags/SmartTag/QueryVar.php)

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