Custom New User Notification <= 1.2.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via 'User Mail Subject' Setting

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-3551
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-16 06:16:10 UTC
Updated2026-04-16 06:16:10 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 4.4 MEDIUM from [email protected]

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

EPSS: 0.000170000 probability, percentile 0.042630000 (date 2026-04-16)

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary4.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED4.4MEDIUMCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rafasashi Custom New User Notification affected 1.2.0 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/custom-new-user-notification/tags/1.2.0/admin/include... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-new-user-notification/trunk/admin/includes.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-new-user-notification/trunk/admin/includes.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-new-user-notification/tags/1.2.0/admin/include... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-new-user-notification/trunk/admin/includes.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-new-user-notification/trunk/admin/includes.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-new-user-notification/tags/1.2.0/admin/include... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-new-user-notification/trunk/admin/includes.php [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/7a14d35d-144c-4ddd-b288-5e0e0... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/custom-new-user-notification/trunk/custom-new-user-no... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-new-user-notification/tags/1.2.0/admin/include... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-new-user-notification/tags/1.2.0/admin/include... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-new-user-notification/tags/1.2.0/admin/include... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-new-user-notification/trunk/admin/includes.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-new-user-notification/tags/1.2.0/admin/include... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-new-user-notification/trunk/admin/includes.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/custom-new-user-notification/tags/1.2.0/custom-new-us... [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Muhammad Nur Ibnu Hubab (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-04-15T16:46:28.000ZDisclosed
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