pattihis Simple Custom Login Page Plugin up to 1.0.3 on WordPress Settings API register_setting cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, has been found in pattihis Simple Custom Login Page Plugin up to 1.0.3 on WordPress. This issue affects the function register_setting of the component Settings API. Performing a manipulation results in cross site scripting. This vulnerability is reported as CVE-2026-10100. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in pattihis Simple Custom Login Page Plugin up to 1.0.3 on WordPress. This affects the function register_setting of the component Settings API. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

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 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.

The weakness was disclosed by Nguyen Duong. It is possible to read the advisory at wordfence.com. This vulnerability is uniquely identified as CVE-2026-10100 since 05/29/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. Additional levels of successful authentication are required for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 1.0.3 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Vendor

• pattihis

Name

• Simple Custom Login Page Plugin

Version

• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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