Attack Chain

1. Discovery: An unauthenticated attacker identifies a WordPress instance running the vulnerable "Invoice Generator" plugin (versions up to and including 1.0.0).
2. Target Identification: The attacker identifies the user_id (e.g., typically 1 for the main administrator) and a legitimate administrator username on the target WordPress site.
3. Email Modification Request: The attacker sends an unauthenticated HTTP POST request to /wp-admin/admin-ajax.php with the action=pravel_invoice_edit_account parameter in the query string and includes the target user_id and a new, attacker-controlled user_email in the POST body or query parameters.
4. Vulnerability Trigger: The vulnerable plugin's pravel_invoice_edit_account() function, lacking proper authentication and authorization checks, processes the request and updates the target administrator's email address to the attacker-provided email.
5. Password Reset Initiation: The attacker navigates to the WordPress login page and initiates a password reset flow for the targeted administrator account using the administrator's username.
6. Password Reset Delivery: WordPress sends the password reset link to the newly assigned, attacker-controlled email address.
7. Account Takeover: The attacker accesses the attacker-controlled email inbox, clicks the password reset link, sets a new password, and successfully logs into the WordPress site as the administrator.
8. Impact: The attacker gains full administrative control over the WordPress site, enabling various malicious activities.

Impact

Successful exploitation of CVE-2026-12415 leads to complete administrative control over the affected WordPress site. This allows attackers to perform a wide range of damaging actions, including website defacement, injection of malicious code (e.g., for drive-by downloads or phishing campaigns), exfiltration of sensitive data from the site's database, or using the compromised site as a platform for further attacks. Organizations running the vulnerable plugin face a high risk of website takeover, reputational damage, and potential compliance breaches if sensitive customer data is stored on the platform.

Recommendation

• Prioritize patching the "Invoice Generator" WordPress plugin to a version greater than 1.0.0 immediately.
• Deploy the provided Sigma rule to your SIEM to detect exploitation attempts against CVE-2026-12415.
• Ensure web server access logs are collected for the webserver category, as this log source is crucial for detecting exploitation.