CVE-2026-10100
MediumCVSS 4.4Exploitation Probability (EPSS)
Low risk8th percentile - higher than 8% of all known CVEs
Summary
The Simple Custom Login Page plugin for WordPress up to version 1.0.3 is vulnerable to Stored XSS via color settings fields. Attackers with administrator access can inject arbitrary CSS rules that are rendered on the login page for all unauthenticated users, enabling UI-redress and phishing attacks.
Risk Assessment
Injected CSS rules can lead to credential theft and account takeover.
Recommendation
Update the plugin to the latest version and add proper sanitization of color values.
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Original NVD description (English source)
The Simple Custom Login Page plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the color settings fields (Page Background, Form Background, Text Color, Link Color) in versions up to and including 1.0.3. This is due to insufficient input sanitization of the color option values (they were registered with register_setting() and stored via the Settings API/update_option() with no sanitize_callback) combined with the values being output into a <style> block on wp-login.php using esc_attr(), which is incorrect for a CSS context (it does not escape ;, {, }, / or *). This makes it possible for authenticated attackers, with administrator-level access and above, to inject arbitrary CSS rules into the login page that are rendered for all unauthenticated visitors, enabling UI-redress and credential-phishing attacks.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

