# Bit Form <= 3.4.0 - Unauthenticated Stored Cross-Site Scripting via URL Field

- **ID:** WPSEC-2026-2655
- **Plugin:** Bit Form – Contact Form, Payment Forms, Multi Step Forms, Calculator & Custom Form Builder (`bit-form`), https://wordpress.org/plugins/bit-form/
- **Affected versions:** all versions before 3.5.0
- **Fixed in:** 3.5.0 (Update to 3.5.0 or later.)
- **Severity:** Medium 6.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-11-06)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/bit-form
- **Fix released:** 2026-11-05
- **Published:** 2026-11-06
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2655/

## Description

The Bit Form plugin for WordPress is vulnerable to Stored Cross-Site Scripting via URL field submissions in all versions up to, and including, 3.4.0. The cause is insufficient validation of URL schemes, which allowed javascript:, data: and vbscript: links to be stored and rendered as links on entry screens. This makes it possible for unauthenticated attackers to inject arbitrary scripts that execute when an administrator viewing the entry clicks the injected link.

## References

- https://wpsec.com/vuln/WPSEC-2026-2655/
- https://plugins.svn.wordpress.org/bit-form/tags/3.5.0/
- https://wordpress.org/plugins/bit-form/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2655/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.