CVE-2026-14602: Remote API WordPress Plugin RCE Vulnerability

CVE-2026-14602 Overview

CVE-2026-14602 affects the Remote API WordPress plugin through version 0.2. The plugin deserializes user-supplied input without authenticating the request first. Unauthenticated attackers can inject arbitrary PHP objects into the deserialization process. When a suitable gadget chain exists through another installed plugin or theme, this object injection can escalate to remote code execution on the WordPress host.

Critical Impact
Unauthenticated remote attackers can trigger PHP object injection and, with a viable gadget chain, achieve remote code execution on the affected WordPress site.

Affected Products

Remote API WordPress plugin, all versions through 0.2
WordPress installations that expose the plugin's unauthenticated endpoints
Sites where a companion plugin or theme provides an exploitable gadget chain

Discovery Timeline

2026-07-30 - CVE-2026-14602 published to NVD
2026-07-30 - Last updated in NVD database

Technical Details for CVE-2026-14602

Vulnerability Analysis

The Remote API plugin accepts serialized PHP data from remote callers and passes it to a deserialization routine before performing any authentication check. PHP's unserialize() function reconstructs objects by invoking magic methods such as __wakeup(), __destruct(), and __toString() on the resulting instances. Any class already loaded in the WordPress process becomes reachable at that point.

An attacker crafts a serialized payload that instantiates classes with side-effectful magic methods. If those methods, alone or as part of a chain across plugins or themes, reach functions like call_user_func, eval, include, or filesystem writers, the payload achieves code execution. This class of flaw is tracked as insecure deserialization [CWE-502] and PHP object injection [CWE-915].

Root Cause

The root cause is twofold. First, the endpoint that receives the API request omits authentication and capability checks, so any anonymous caller reaches the vulnerable handler. Second, the handler applies unserialize() to attacker-controlled input without validating structure, type, or allowed classes. WordPress's rich autoloaded class surface makes gadget chains readily available once object instantiation is attacker-controlled.

Attack Vector

Exploitation requires only network access to the WordPress site's API endpoint exposed by the plugin. An attacker submits an HTTP request containing a serialized PHP object payload. The plugin deserializes the payload and instantiates attacker-chosen classes, triggering their magic methods during construction or destruction. When those methods chain into sensitive sinks provided by another installed plugin, the attacker gains arbitrary code execution in the web server context. See the WPScan Vulnerability Advisory for advisory details.

Detection Methods for CVE-2026-14602

Indicators of Compromise

HTTP requests to Remote API plugin endpoints containing serialized PHP markers such as O:, a:, or s: in POST bodies or query parameters
New or modified PHP files under wp-content/uploads/, wp-content/plugins/, or the WordPress root written by the web server user
Unexpected outbound connections from the php-fpm or web server process to attacker infrastructure
Creation of new administrator accounts or unexpected changes to wp_options and wp_users tables

Detection Strategies

Inspect web server access logs for POST requests to Remote API plugin routes from unauthenticated sources
Alert on request bodies matching PHP serialization patterns delivered to WordPress endpoints
Monitor PHP error logs for unserialize() warnings, class-not-found errors, or magic method failures
Baseline WordPress file integrity and flag additions or modifications to PHP files after plugin traffic

Monitoring Recommendations

Enable verbose logging on the WordPress reverse proxy or WAF, including full request bodies for API paths
Forward web, PHP, and OS logs to a centralized analytics tier for correlation across signals
Track child process creation from the web server user, focusing on shells, wget, curl, and interpreters
Review scheduled tasks and cron entries created after suspected exploitation windows

How to Mitigate CVE-2026-14602

Immediate Actions Required

Deactivate and remove the Remote API WordPress plugin until a fixed version is confirmed available
Restrict access to WordPress admin and API endpoints by IP allowlist where operationally feasible
Rotate WordPress secret keys, database credentials, and administrator passwords if exploitation is suspected
Audit installed plugins and themes to reduce the pool of classes usable as gadget chains

Patch Information

No vendor-supplied fixed version is referenced in the advisory as of publication. The plugin is reported vulnerable through version 0.2. Consult the WPScan Vulnerability Advisory for updates on patch availability.

Workarounds

Block requests to the plugin's endpoints at the WAF or reverse proxy layer
Filter request bodies containing PHP serialization prefixes such as O: followed by a digit and quoted class name
Remove the plugin directory from wp-content/plugins/ if deactivation cannot be performed through the admin UI
Enforce least privilege on the web server user to limit impact of successful code execution

bash

# Example NGINX rule to block the vulnerable plugin path
location ~* /wp-content/plugins/remote-api/ {
    return 403;
}

# Remove the plugin from disk
rm -rf /var/www/html/wp-content/plugins/remote-api