# Nexter Extension – Site Enhancements Toolkit <= 4.7.6 - Unauthenticated Login Attempt Limit Bypass via IP Spoofing

- **ID:** WPSEC-2026-0982
- **Plugin:** Nexter Extension – Security, Performance, Code Snippets & Site Toolkit (`nexter-extension`), https://wordpress.org/plugins/nexter-extension/
- **Affected versions:** from 4.3.0 before 4.7.7
- **Fixed in:** 4.7.7 (Update to 4.7.7 or later.)
- **Severity:** Medium 6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L)
- **Weakness:** CWE-348
- **Usage among sites WPSec scans:** plugin Low, affected versions None seen (as of 2026-10-15)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/nexter-extension
- **Fix released:** 2026-08-19
- **Published:** 2026-10-15
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0982/

## Description

The Nexter Extension plugin for WordPress is vulnerable to a brute-force protection bypass via IP address spoofing in all versions up to, and including, 4.7.6. This is due to the Limit Login Attempts feature trusting the user-controllable Client-IP and X-Forwarded-For headers to determine the visitor's IP address. This makes it possible for unauthenticated attackers to evade the login attempt lockout by rotating spoofed IP addresses, or to lock out other users by spoofing their IP addresses, when the Limit Login Attempts feature is enabled.

## References

- https://wpsec.com/vuln/WPSEC-2026-0982/
- https://plugins.svn.wordpress.org/nexter-extension/tags/4.7.7/
- https://wordpress.org/plugins/nexter-extension/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0982/

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.