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Description

The Custom New User Notification plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's admin settings in all versions up to, and including, 1.2.0. This is due to insufficient input sanitization and output escaping on multiple settings fields including 'User Mail Subject', 'User From Name', 'User From Email', 'Admin Mail Subject', 'Admin From Name', and 'Admin From Email'. The settings are registered via register_setting() without sanitize callbacks, and the values retrieved via get_option() are echoed directly into HTML input value attributes without esc_attr(). This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts in the plugin settings page that will execute whenever a user accesses that page. This could be used in multi-site installations where administrators of subsites could target super administrators.

PUBLISHED Reserved 2026-03-04 | Published 2026-04-16 | Updated 2026-04-16 | Assigner Wordfence




MEDIUM: 4.4CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Default status
unaffected

Any version
affected

Timeline

2026-04-15:Disclosed

Credits

Muhammad Nur Ibnu Hubab finder

References

www.wordfence.com/...-144c-4ddd-b288-5e0e006fb165?source=cve

plugins.trac.wordpress.org/...ation/trunk/admin/includes.php

plugins.trac.wordpress.org/.../tags/1.2.0/admin/includes.php

plugins.trac.wordpress.org/...ation/trunk/admin/includes.php

plugins.trac.wordpress.org/.../tags/1.2.0/admin/includes.php

plugins.trac.wordpress.org/...ation/trunk/admin/includes.php

plugins.trac.wordpress.org/.../tags/1.2.0/admin/includes.php

plugins.trac.wordpress.org/...ation/trunk/admin/includes.php

plugins.trac.wordpress.org/.../tags/1.2.0/admin/includes.php

plugins.trac.wordpress.org/...ation/trunk/admin/includes.php

plugins.trac.wordpress.org/.../tags/1.2.0/admin/includes.php

plugins.trac.wordpress.org/...ation/trunk/admin/includes.php

plugins.trac.wordpress.org/.../tags/1.2.0/admin/includes.php

plugins.trac.wordpress.org/...ation/trunk/admin/includes.php

plugins.trac.wordpress.org/.../tags/1.2.0/admin/includes.php

plugins.trac.wordpress.org/...stom-new-user-notification.php

plugins.trac.wordpress.org/...stom-new-user-notification.php

cve.org (CVE-2026-3551)

nvd.nist.gov (CVE-2026-3551)

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