CVE-2026-57410 Overview
CVE-2026-57410 is an Incorrect Privilege Assignment vulnerability [CWE-266] in the MailerPress WordPress plugin developed by MailerPress Team. The flaw affects all versions of MailerPress up to and including 2.0.2. An authenticated attacker with low-level privileges can escalate to higher-privilege roles on affected WordPress sites. Successful exploitation impacts confidentiality, integrity, and availability of the target site.
Critical Impact
Authenticated low-privilege users can escalate privileges to administrator-level roles, leading to full compromise of the WordPress installation, including content manipulation, plugin installation, and data exfiltration.
Affected Products
- MailerPress plugin for WordPress (all versions through 2.0.2)
- WordPress sites using MailerPress by MailerPress Team
- Any environment where low-privileged WordPress accounts can authenticate to a vulnerable MailerPress instance
Discovery Timeline
- 2026-07-13 - CVE-2026-57410 published to NVD
- 2026-07-13 - Last updated in NVD database
Technical Details for CVE-2026-57410
Vulnerability Analysis
The vulnerability stems from incorrect privilege assignment logic within the MailerPress plugin. The plugin fails to enforce proper role and capability checks when assigning or modifying user privileges. An attacker with an existing authenticated account can invoke plugin functionality that grants elevated capabilities beyond their intended role.
The issue is exploitable over the network with low complexity. The attacker requires only low-level authentication, such as a subscriber or contributor role, and no user interaction is needed. Because WordPress relies on role-based capabilities to gate administrative functions, an attacker who reaches an administrator role can install arbitrary plugins, modify site content, and access all stored data.
Root Cause
The root cause is classified under [CWE-266] Incorrect Privilege Assignment. The plugin assigns privileges to users without adequately validating the requesting user's authority. This design flaw allows lower-privileged accounts to acquire capabilities that should be restricted to administrators.
Attack Vector
The attack is delivered over the network against the vulnerable WordPress site. The attacker authenticates with any low-privilege account, then interacts with the MailerPress plugin endpoint that mishandles privilege assignment. See the Patchstack Vulnerability Report for additional technical details.
Detection Methods for CVE-2026-57410
Indicators of Compromise
- Unexpected changes to WordPress user roles, especially subscribers or contributors promoted to administrator.
- New administrator accounts created shortly after authenticated requests from low-privilege sessions.
- Unusual requests to MailerPress plugin endpoints under /wp-admin/admin-ajax.php or /wp-json/ originating from non-administrator users.
- Installation of unfamiliar plugins or themes following MailerPress activity in access logs.
Detection Strategies
- Audit the WordPress wp_usermeta table for unauthorized wp_capabilities modifications correlated with MailerPress request activity.
- Correlate authentication logs with role change events to identify privilege escalation patterns.
- Review web server logs for requests to MailerPress plugin routes made by users lacking administrator capabilities.
Monitoring Recommendations
- Enable WordPress audit logging plugins to capture user role and capability changes in real time.
- Alert on any promotion of accounts to administrator, editor, or custom privileged roles.
- Monitor MailerPress plugin endpoints for anomalous request volume or unusual parameter values.
How to Mitigate CVE-2026-57410
Immediate Actions Required
- Deactivate the MailerPress plugin until a patched version is installed and verified.
- Review all WordPress user accounts and revoke any unauthorized elevated privileges.
- Rotate credentials for all administrator accounts and enforce multi-factor authentication on privileged users.
- Restrict registration and lower the trust level of self-service account creation while the vulnerability is unmitigated.
Patch Information
At the time of publication, the vulnerability affects MailerPress versions through 2.0.2. Review the Patchstack Vulnerability Report for the latest fixed version guidance and vendor updates. Apply the vendor-supplied patch as soon as it becomes available.
Workarounds
- Disable the MailerPress plugin on all affected WordPress instances until a fix is available.
- Block access to MailerPress plugin endpoints at the web application firewall for non-administrator users.
- Temporarily disable open user registration to reduce the pool of accounts eligible to authenticate and exploit the flaw.
# Configuration example: disable the MailerPress plugin via WP-CLI
wp plugin deactivate mailerpress
wp plugin status mailerpress
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
