CVE-2026-10100

Published: Giu 02, 2026 Last Modified: Giu 02, 2026

ExploitDB:

Other exploit source:

Google Dorks:

MEDIUM 4,4

Source: [email protected]

Attack Vector: network

Attack Complexity: high

Privileges Required: high

User Interaction: none

Scope: changed

Confidentiality: low

Integrity: low

Availability: none

Description

AI Translation Available

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.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Stable

Abstraction: Base Structure: Simple

Common Consequences

Security Scopes Affected:

Access Control Confidentiality Integrity Availability

Potential Impacts:

Bypass Protection Mechanism Read Application Data Execute Unauthorized Code Or Commands

Applicable Platforms

Technologies: AI/ML, Web Based, Web Server

Likelihood of Exploit: High

View CWE Details

https://plugins.trac.wordpress.org/browser/simple-custom-lo…

https://plugins.trac.wordpress.org/browser/simple-custom-login-page/tags/1.0.3/…