EUVD-2026-59847
GHSA-jqwr-hf6q-qx2c
Severity by source
AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
Admin privileges and non-default deployment (PR:H/AC:H); victim must visit the login page (UI:R); scope changes to victim browser context.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Stored Cross-Site Scripting in the Weblizar Admin Custom Login WordPress plugin (all versions ≤ 3.6.4) allows an authenticated administrator to inject persistent malicious scripts into the WordPress login page, which then execute in the browsers of any user who visits it - including unauthenticated visitors. The vulnerability is conditionally exploitable: it only manifests on WordPress multi-site networks or single-site installations where the unfiltered_html capability has been explicitly revoked from administrators, both non-default configurations. No public exploit has been identified at time of analysis, and the vulnerability is not listed in the CISA KEV catalog.
Technical ContextAI
The Admin Custom Login plugin (CPE: cpe:2.3:a:weblizar:admin_custom_login:*:*:*:*:*:*:*:*) by Weblizar allows WordPress site owners to visually customize the wp-login.php page via an admin settings interface. The vulnerability class is CWE-79 (Improper Neutralization of Input During Web Page Generation - Cross-site Scripting), specifically the stored/persistent variant, where attacker-controlled data is written to the database and later rendered without escaping. Source-level references pinpoint two distinct unsanitized output locations: login-form-screen.php at line 162 and includes/login-form-setting/login-form-background.php at line 759. WordPress natively grants administrators the unfiltered_html capability on single-site installs, which bypasses many XSS mitigations; this vulnerability only surfaces when that safeguard is absent - either because the site is a multi-site network (where administrators are inherently less trusted than super-admins) or because unfiltered_html has been deliberately hardened away.
RemediationAI
A fix commit is available in the WordPress plugin Subversion repository (https://plugins.trac.wordpress.org/changeset?reponame=&old=3510948%40admin-custom-login&new=3510948%40admin-custom-login); however, no specific patched release version number is independently confirmed from the provided data - site owners should update the plugin to the latest available version via the WordPress admin dashboard or via WP-CLI (wp plugin update admin-custom-login) and verify the installed version exceeds 3.6.4. As a compensating control for environments that cannot immediately update, granting or restoring the unfiltered_html capability to administrator roles on single-site installations removes this attack path without other side effects, though it re-enables administrators to post raw HTML - acceptable in trusted environments. On multi-site networks where this is not feasible, limiting administrator role assignment to thoroughly vetted users and auditing login-page customization settings for unexpected script content reduces exposure. Restricting admin panel access by IP allowlist limits the set of accounts that could introduce a payload, though it does not prevent execution for all login-page visitors.
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External POC / Exploit Code
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