CVE-2026-81761 Overview
CVE-2026-81761 is a broken access control vulnerability affecting the WpEvently (mage-eventpress) WordPress plugin in versions up to and including 5.5.0. The flaw allows authenticated users holding the low-privilege Subscriber role to access plugin functionality that should be restricted to higher-privilege accounts. The weakness is categorized under CWE-862: Missing Authorization. Exploitation requires network access and valid subscriber credentials but no user interaction. According to the CVSS vector, the impact is limited to confidentiality, with no integrity or availability effects. Site operators running the affected plugin should review advisory guidance from Patchstack and update or restrict subscriber registrations.
Critical Impact
Authenticated attackers with Subscriber-level access can invoke plugin actions or read data intended for higher-privilege roles, exposing event and configuration information stored by WpEvently.
Affected Products
- WpEvently (mage-eventpress) WordPress plugin
- Plugin versions 5.5.0 and earlier
- WordPress sites permitting open Subscriber registration with the plugin installed
Discovery Timeline
- 2026-08-28 - CVE-2026-81761 published to NVD
- 2026-08-28 - Last updated in NVD database
Technical Details for CVE-2026-81761
Vulnerability Analysis
The vulnerability is a missing authorization flaw in the WpEvently plugin. One or more plugin endpoints or AJAX actions fail to verify that the calling user holds the required capability before executing privileged functionality. As a result, any authenticated user, including those with the default Subscriber role, can trigger operations intended for administrators or event managers.
Broken access control in WordPress plugins commonly arises when developers rely solely on is_user_logged_in() or a nonce check without also calling current_user_can() with an appropriate capability. The confidentiality-only impact indicated by the advisory suggests the exposed endpoints leak plugin data rather than allow modification.
Root Cause
The root cause is missing role and capability enforcement on plugin request handlers. Authorization logic either omits capability checks entirely or applies checks that a Subscriber can satisfy. Refer to the Patchstack Vulnerability Report for endpoint-level details.
Attack Vector
An attacker registers or obtains a Subscriber account on a target WordPress site running WpEvently 5.5.0 or earlier. The attacker then sends authenticated HTTP requests directly to the vulnerable plugin action, bypassing the WordPress admin UI. Because the endpoint does not enforce a capability check, the plugin returns data or performs the action as if the user were authorized. No verified public exploit code is available for this CVE at the time of publication.
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Stop Identity AttacksDetection Methods for CVE-2026-81761
Indicators of Compromise
- Authenticated requests from Subscriber-role accounts to WpEvently admin-ajax endpoints or plugin REST routes.
- Unexpected access patterns to wp-admin/admin-ajax.php with action parameters referencing mage-eventpress or wpevently handlers.
- Creation of Subscriber accounts from anonymous or disposable email addresses shortly before plugin endpoint access.
Detection Strategies
- Review WordPress access logs for POST or GET requests to plugin AJAX or REST endpoints originating from non-administrator sessions.
- Enable WordPress audit logging to record capability checks and privileged plugin actions.
- Correlate new user registrations with subsequent access to admin-ajax.php actions belonging to the mage-eventpress plugin.
Monitoring Recommendations
- Alert on spikes in Subscriber-account HTTP requests targeting plugin endpoints.
- Monitor for enumeration of plugin AJAX action names in web server logs.
- Track outbound data volume from admin-ajax.php responses to identify potential bulk data retrieval.
How to Mitigate CVE-2026-81761
Immediate Actions Required
- Update the WpEvently (mage-eventpress) plugin to a version later than 5.5.0 once the vendor publishes a fixed release.
- Disable open user registration or restrict the default new-user role away from Subscriber where feasible.
- Audit existing Subscriber accounts and remove those that are unused or unverified.
- Deploy a Web Application Firewall (WAF) rule set that blocks unauthorized calls to plugin AJAX and REST endpoints.
Patch Information
Consult the Patchstack advisory for the current fixed version and vendor patch status. Apply the latest available WpEvently release through the WordPress plugin updater once published.
Workarounds
- Temporarily deactivate the WpEvently plugin if it is not business-critical.
- Use a WordPress security plugin or WAF to block Subscriber-role requests to plugin endpoints until an update is applied.
- Disable public account registration through the WordPress General Settings until mitigation is verified.
# Disable open registration via wp-cli until a patched plugin version is available
wp option update users_can_register 0
# Verify current default role and reset if necessary
wp option get default_role
wp option update default_role subscriber
# Deactivate the vulnerable plugin as a temporary control
wp plugin deactivate mage-eventpress
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
