Security Optimizer permits IP login-restriction bypass
Security Optimizer 1.5.8 through 1.6.4 incorrectly validates requests handled by its optional IP-based login restriction. An unauthenticated request outside the administrator's allowlist can bypass that gate and reach the WordPress login form. This defeats the configured IP restriction but does not bypass WordPress credentials. The crafted request property, header or parameter, route and validation function are not disclosed.
- Component
- Security Optimizer
- Plugin slug
sg-security- Affected
- 1.5.8 to < 1.6.5
- Safe version
1.6.5- Published
- Aug 06, 2026
This CVE was published Aug 06, 2026 and is one of 4 known issues for this plugin.
Update, patch or deactivate.
Update Security Optimizer to 1.6.5 or later. Until updated, do not rely on its IP restriction as the sole protection for the login surface.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The Security Optimizer WordPress plugin from 1.5.8 to 1.6.4 does not correctly validate requests to its optional IP-based login restriction feature, allowing the restriction to be bypassed so that unauthenticated requests from non-allowlisted IP addresses can reach and use the login form, defeating the access control the administrator configured.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N