# Joinchat <= 6.4.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via Joinchat Button Block 'message' Attribute

- **ID:** WPSEC-2026-0886
- **Plugin:** Joinchat – Enhanced “click to chat” (`creame-whatsapp-me`), https://wordpress.org/plugins/creame-whatsapp-me/
- **Affected versions:** from 6.3.2 before 6.4.2
- **Fixed in:** 6.4.2 (Update to 6.4.2 or later.)
- **Severity:** Medium 6.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin High, affected versions High (as of 2026-10-14)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/creame-whatsapp-me
- **Fix released:** 2026-10-13
- **Published:** 2026-10-14
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0886/

## Description

The Joinchat plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'message' attribute of the Joinchat Button block in all versions up to, and including, 6.4.1 due to insufficient output escaping when the value is placed in the button's data-message HTML attribute. 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.

## References

- https://wpsec.com/vuln/WPSEC-2026-0886/
- https://plugins.svn.wordpress.org/creame-whatsapp-me/tags/6.4.2/
- https://wordpress.org/plugins/creame-whatsapp-me/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0886/

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.