CVE-2026-2487
Received Received - Intake

Stored XSS in Admin Custom Login WordPress Plugin

Publication date: 2026-08-16

Last updated on: 2026-08-16

Assigner: Wordfence

Description
The Admin Custom Login plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 3.6.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

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Meta Information

Published
2026-08-16
Last Modified
2026-08-16
Generated
2026-08-16
AI Q&A
2026-08-16
EPSS Evaluated
N/A
NVD
CVE-2026-2487
EUVD
EUVD-2026-59847

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
admin_custom_login admin_custom_login to 3.6.4 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
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.

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Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) flaw in the Admin Custom Login WordPress plugin versions up to 3.6.4. It occurs due to insufficient input sanitization and output escaping in admin settings. Authenticated attackers with administrator-level permissions can inject malicious scripts into pages. These scripts execute when users access the affected pages. The vulnerability only impacts multi-site installations or setups where unfiltered_html has been disabled.

Detection Guidance

This vulnerability can be detected by reviewing WordPress installations for the Admin Custom Login plugin versions up to 3.6.4. Check for unauthorized script injections in admin settings or pages. No specific commands are provided in the context.

Impact Analysis

If exploited, this vulnerability allows attackers to inject malicious scripts into your WordPress site. These scripts can steal user data, hijack sessions, or deface your website. Since it requires administrator access, the risk is limited to users with such permissions. However, if untrusted users gain admin access, the impact could be severe, including unauthorized actions and data breaches.

Compliance Impact

This vulnerability could lead to data breaches, which may violate GDPR and HIPAA requirements for protecting user data. GDPR mandates strict data protection measures, and a breach could result in fines. HIPAA requires safeguarding protected health information, and exploitation could lead to unauthorized access, triggering compliance violations and penalties.

Mitigation Strategies
  • Update the Admin Custom Login plugin to the latest version beyond 3.6.4 if available.
  • Review and remove any suspicious scripts or unauthorized changes in admin settings.
  • Ensure input sanitization and output escaping are properly configured in WordPress settings.
  • Restrict administrator-level permissions to trusted users only.

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