CVE-2026-15257 Overview
CVE-2026-15257 affects the RegistrationMagic WordPress plugin in versions before 6.0.9.4. The plugin fails to perform authorization, ownership, or nonce checks on a front-end submission-editing action. Unauthenticated attackers can overwrite other users' form submissions and modify the profile fields of associated non-administrator WordPress accounts.
The vulnerability represents a broken access control flaw combined with a missing Cross-Site Request Forgery (CSRF) protection [CWE-862, CWE-352]. Because no authentication is required, exploitation can be automated at scale against exposed WordPress sites running the plugin.
Critical Impact
Unauthenticated attackers can tamper with arbitrary user submissions and overwrite profile data of non-administrator accounts on affected WordPress sites.
Affected Products
- RegistrationMagic WordPress plugin versions prior to 6.0.9.4
- WordPress sites using RegistrationMagic front-end submission editing
- Non-administrator WordPress user accounts managed via RegistrationMagic forms
Discovery Timeline
- 2026-07-30 - CVE-2026-15257 published to NVD
- 2026-07-30 - Last updated in NVD database
Technical Details for CVE-2026-15257
Vulnerability Analysis
RegistrationMagic exposes a front-end action that allows users to edit previously submitted form data. The vulnerable handler processes submission edits without validating three critical controls: user authentication, ownership of the target submission, and a valid WordPress nonce.
An attacker can send a crafted HTTP request referencing another user's submission identifier. The plugin accepts the request and writes the attacker-supplied values to the target submission record. When the submission is bound to a WordPress user profile, the associated profile fields are also overwritten.
The issue is limited to non-administrator accounts, which constrains impact to horizontal tampering rather than privilege escalation to administrator. However, attackers can still corrupt user records, hijack account metadata, alter contact information, and prepare downstream social engineering or account takeover paths.
Root Cause
The root cause is missing authorization logic in the front-end submission-editing endpoint. The code path does not call current_user_can() for capability enforcement, does not verify that the requesting user owns the submission being modified, and does not validate a WordPress nonce via wp_verify_nonce() or check_admin_referer().
Attack Vector
Exploitation requires no authentication. An attacker sends an HTTP POST request to the vulnerable submission-editing endpoint, supplying the identifier of a target submission and the fields to overwrite. The plugin processes the request and persists the changes.
Because the vulnerability is network-reachable and requires no user interaction, mass scanning of WordPress sites running RegistrationMagic is feasible. Technical details are described in the WPScan Vulnerability Report.
Detection Methods for CVE-2026-15257
Indicators of Compromise
- Unexpected modifications to user profile fields on WordPress accounts managed through RegistrationMagic
- POST requests to RegistrationMagic front-end submission-editing endpoints from unauthenticated sessions
- Submission records showing edit timestamps that do not correlate with owner login sessions
- User reports of altered contact details, names, or custom profile data
Detection Strategies
- Review web server access logs for POST requests to RegistrationMagic action handlers originating from anonymous or unauthenticated clients
- Correlate WordPress wp_users and wp_usermeta change events against authenticated session logs
- Alert on submission edits where the acting session has no WordPress authentication cookie
- Monitor for high-volume POST requests targeting a single plugin endpoint across many submission IDs
Monitoring Recommendations
- Enable WordPress audit logging for user profile and usermeta changes
- Forward web server and WordPress logs to a centralized platform for correlation
- Baseline normal submission-editing volume and alert on statistical deviations
- Track failed and successful edits per source IP to identify enumeration behavior
How to Mitigate CVE-2026-15257
Immediate Actions Required
- Update the RegistrationMagic plugin to version 6.0.9.4 or later on all WordPress sites
- Audit wp_users and wp_usermeta tables for unauthorized changes since the plugin was installed
- Reset passwords and require re-verification for accounts whose profile data may have been altered
- Restrict access to RegistrationMagic front-end endpoints at the web application firewall until patched
Patch Information
Upgrade RegistrationMagic to version 6.0.9.4 or later. The fixed release adds the missing authorization, ownership, and nonce checks on the front-end submission-editing action. Refer to the WPScan Vulnerability Report for advisory details.
Workarounds
- Disable the RegistrationMagic plugin until the patched version can be installed
- Block unauthenticated POST requests to RegistrationMagic AJAX and form-handling endpoints via a WAF rule
- Restrict front-end submission editing to authenticated sessions using server-level access controls
- Temporarily remove or hide front-end submission-edit links to reduce exposure of the vulnerable endpoint
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
