TutorStarter <= 4.0.3 — Unauthenticated Unauthorized User Account Creation
CVE-2026-104671Published · Updated Action summary
Affected: ≤4.0.3Update to 4.0.4 or newer
All remediation stepsOn this page6
Overview
- Advisory ID
- CVE-2026-104671
- Product
- TutorStarter tutorstarter
- Affected
- ≤4.0.3
- Fixed in
- 4.0.4
- Required access
- No account needed
- Published
- · updated
- Credit
- Alexander Jurkschat
- Source
- Wordfence Intelligence
- Affected≤ 4.0.3
- Patched in4.0.4
Update to 4.0.4 or newer.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NWhat does this vector mean?
AV:NAttack vector- Network
AC:LAttack complexity- Low
PR:NPrivileges required- None
UI:NUser interaction- None
S:UScope- Unchanged
C:NConfidentiality- None
I:LIntegrity- Low
A:NAvailability- None
Not sure which version you run? Run a passive check — it reads public files only.
Summary
The TutorStarter theme for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 4.0.3. This is due to missing check against the site's users_can_register option in the wp_ajax_nopriv_ajaxregister AJAX handler. This makes it possible for unauthenticated attackers to register new WordPress user accounts even when user registration has been disabled by the site administrator.
Remediation & mitigations
- Update to version 4.0.4, or a newer patched version
- Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
Advisory
Source description from Wordfence Intelligence, credited to Alexander Jurkschat.
The TutorStarter theme for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 4.0.3. This is due to missing check against the site's users_can_register option in the wp_ajax_nopriv_ajaxregister AJAX handler. This makes it possible for unauthenticated attackers to register new WordPress user accounts even when user registration has been disabled by the site administrator.
Exploits & references
Proof-of-concept & detection
No public proof-of-concept or detection template is known for this vulnerability.
Advisories & patches
- Advisorywordfence.com
Timeline
CVE published
Severity medium, CVSS 5.3
Record last updated
Sources & licenses
Wordfence record- Vulnerability data
- Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
- CVE® identifiers
- Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
- CVSS / CWE
- National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
- EPSS
- Exploit Prediction Scoring System by FIRST.org.
- VulnCrest content
- Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.