# Theme My Login <= 7.3.0 - Cross-Site Request Forgery to Multisite Site Creation via Signup Form

- **ID:** WPSEC-2026-0908
- **Plugin:** Theme My Login (`theme-my-login`), https://wordpress.org/plugins/theme-my-login/
- **Affected versions:** all versions before 7.3.1
- **Fixed in:** 7.3.1 (Update to 7.3.1 or later.)
- **Severity:** Medium 4.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-352
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-10-14)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/theme-my-login
- **Fix released:** 2026-10-13
- **Published:** 2026-10-14
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0908/

## Description

The Theme My Login plugin for WordPress is vulnerable to Cross-Site Request Forgery via the multisite signup form in all versions up to, and including, 7.3.0, due to missing nonce validation in the tml_ms_signup_handler() function. This makes it possible for unauthenticated attackers to create a new site owned by a logged-in user through the 'gimmeanotherblog' signup stage, using a forged request, if they can trick that user into performing an action such as clicking a link. This only affects multisite networks that allow site signups.

## References

- https://wpsec.com/vuln/WPSEC-2026-0908/
- https://plugins.svn.wordpress.org/theme-my-login/tags/7.3.1/
- https://wordpress.org/plugins/theme-my-login/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0908/

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.