# Bit Form <= 3.3.1 - Unauthenticated Stored Cross-Site Scripting via SVG File Upload

- **ID:** WPSEC-2026-1516
- **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 3.4.0
- **Fixed in:** 3.4.0 (Update to 3.4.0 or later.)
- **Severity:** High 7.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-23)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/bit-form
- **Fix released:** 2026-10-22
- **Published:** 2026-10-23
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1516/

## Description

The Bit Form plugin for WordPress is vulnerable to Stored Cross-Site Scripting via uploaded SVG files in all versions up to, and including, 3.3.1 due to an outdated bundled SVG sanitizer that could be bypassed. This makes it possible for unauthenticated attackers, submitting a form that accepts SVG uploads, to inject arbitrary web scripts in SVG files that execute whenever a user accesses the uploaded file.

## References

- https://wpsec.com/vuln/WPSEC-2026-1516/
- https://plugins.svn.wordpress.org/bit-form/tags/3.4.0/
- https://wordpress.org/plugins/bit-form/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1516/

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.