CVE-2026-27393: CF7 WOW Styler Auth Bypass Vulnerability

CVE-2026-27393 Overview

CVE-2026-27393 is a Missing Authorization vulnerability [CWE-862] in the Tobias CF7 WOW Styler WordPress plugin. The flaw stems from incorrectly configured access control security levels that allow unauthenticated network attackers to interact with plugin functionality that should be restricted. The issue affects CF7 WOW Styler versions up to and including 1.7.6.

Attackers can exploit the weakness over the network without authentication or user interaction. Successful exploitation has a limited impact on integrity but does not affect confidentiality or availability of the underlying WordPress site.

Critical Impact
Unauthenticated attackers can invoke protected plugin actions because the CF7 WOW Styler plugin fails to enforce authorization checks, leading to unintended modification of plugin state or configuration.

Affected Products

Tobias CF7 WOW Styler WordPress plugin
CF7 WOW Styler versions from n/a through 1.7.6
WordPress sites running the vulnerable cf7-styler plugin

Discovery Timeline

2026-05-21 - CVE-2026-27393 published to NVD
2026-05-21 - Last updated in NVD database

Technical Details for CVE-2026-27393

Vulnerability Analysis

The vulnerability is a broken access control issue tracked under CWE-862: Missing Authorization. CF7 WOW Styler exposes plugin actions that lack proper capability or nonce verification on the server side. When a request reaches the affected handler, the plugin does not validate whether the caller has the appropriate role or permission before executing the action.

An unauthenticated attacker can send crafted HTTP requests directly to the WordPress endpoint that processes plugin functionality. Because authorization checks are missing, the plugin processes these requests as if they originated from a privileged user. The result is unauthorized state changes within the plugin scope.

The attack vector is network-based with low complexity and requires no privileges or user interaction. The impact is limited to integrity, meaning attackers can modify plugin-managed data but cannot directly read sensitive information or take the site offline through this flaw alone.

Root Cause

The root cause is the absence of current_user_can() capability checks and missing nonce verification on AJAX or admin-post handlers within CF7 WOW Styler through version 1.7.6. The plugin registers callable actions without restricting execution to authenticated administrators or editors.

Attack Vector

Exploitation requires only network access to the target WordPress site. An attacker sends an unauthenticated HTTP request to the vulnerable plugin endpoint with parameters that trigger the protected action. No credentials, social engineering, or chained primitives are required. Refer to the Patchstack WordPress Vulnerability Report for additional context on the affected handler.

Detection Methods for CVE-2026-27393

Indicators of Compromise

Unexpected modifications to CF7 WOW Styler plugin settings, styles, or configuration without a corresponding administrator session.
HTTP POST requests to /wp-admin/admin-ajax.php or plugin-specific endpoints referencing CF7 WOW Styler actions from unauthenticated sources.
Anomalous user-agents or repeated requests to cf7-styler plugin paths from a single IP address.

Detection Strategies

Review WordPress access logs for requests targeting cf7-styler plugin endpoints that lack an authenticated session cookie.
Inspect plugin configuration changes against a known-good baseline to identify unauthorized modifications.
Correlate web server logs with WordPress audit logs to flag actions executed without a corresponding login event.

Monitoring Recommendations

Enable a WordPress audit logging plugin to capture all settings changes and AJAX activity associated with installed plugins.
Forward web server and WordPress logs to a centralized logging platform for behavioral analysis across sites.
Alert on bursts of POST requests to admin-ajax.php containing CF7 WOW Styler action parameters from unauthenticated clients.

How to Mitigate CVE-2026-27393

Immediate Actions Required

Identify all WordPress instances running CF7 WOW Styler version 1.7.6 or earlier through plugin inventory tooling.
Deactivate the CF7 WOW Styler plugin on affected sites until a patched release is installed.
Restrict access to /wp-admin/admin-ajax.php endpoints handling cf7-styler actions using a web application firewall rule.

Patch Information

At the time of NVD publication, no fixed version is listed in the enriched data. Monitor the Patchstack advisory and the official WordPress plugin repository for an updated release beyond version 1.7.6 that addresses the missing authorization check.

Workarounds

Remove or deactivate the CF7 WOW Styler plugin until a patched version is available from the vendor.
Apply WAF rules that block unauthenticated requests to CF7 WOW Styler AJAX actions.
Restrict administrative endpoints by source IP where feasible to limit exposure of plugin handlers.

bash

# Configuration example: block unauthenticated CF7 WOW Styler AJAX actions via NGINX
location = /wp-admin/admin-ajax.php {
    if ($arg_action ~* "cf7_?(styler|wow)") {
        if ($http_cookie !~* "wordpress_logged_in_") {
            return 403;
        }
    }
}