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CVE-2026-10100— Simple Custom Login Page <= 1.0.3 - Authenticated (Admin+) Stored Cross-Site Scripting

CVSS 4.4 · Medium
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I. Basic Information for CVE-2026-10100

Vulnerability Information
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Vulnerability Title
Simple Custom Login Page <= 1.0.3 - Authenticated (Admin+) Stored Cross-Site Scripting
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
pattihisSimple Custom Login Page 0 ~ 1.0.3 -

II. Public POCs for CVE-2026-10100

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III. Intelligence Information for CVE-2026-10100

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Patches & Fixes for CVE-2026-10100 (1)

Other References for CVE-2026-10100 (1)

IV. Related Vulnerabilities

Same vendor: pattihis
Same weakness: CWE-79

V. Comments for CVE-2026-10100

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