CVE-2025-31422: Visual Art WordPress Theme RCE Vulnerability

CVE-2025-31422 Overview

CVE-2025-31422 is a PHP Object Injection vulnerability in the designthemes Visual Art | Gallery WordPress Theme. The flaw stems from deserialization of untrusted data [CWE-502] and affects all versions up to and including 2.4. An authenticated attacker with low privileges can submit crafted serialized payloads to the theme, triggering instantiation of arbitrary PHP objects within the WordPress runtime.

When combined with a suitable gadget chain present in WordPress core, other plugins, or the theme itself, exploitation can lead to remote code execution, arbitrary file operations, or full site compromise. The vulnerability is exploitable over the network with low attack complexity.

Critical Impact
Authenticated attackers can inject PHP objects to achieve remote code execution, data tampering, and full compromise of confidentiality, integrity, and availability on affected WordPress sites.

Affected Products

designthemes Visual Art | Gallery WordPress Theme versions through 2.4
WordPress sites running the visual-arts theme
Any WordPress installation where the vulnerable theme is active alongside classes usable as PHP object injection gadgets

Discovery Timeline

2025-07-16 - CVE-2025-31422 published to the National Vulnerability Database (NVD)
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-31422

Vulnerability Analysis

The vulnerability is classified under [CWE-502] Deserialization of Untrusted Data. The Visual Art | Gallery theme passes attacker-controlled input into PHP's unserialize() function without validating or restricting the serialized object structure. When PHP deserializes the payload, it instantiates objects of arbitrary classes available in the current runtime.

PHP automatically invokes magic methods such as __wakeup(), __destruct(), and __toString() on these reconstituted objects. Attackers chain these magic methods through classes loaded by WordPress core, plugins, or the theme to perform unintended actions. Confirmed impact includes arbitrary file read or write, SQL execution through ORM gadgets, and command execution via gadgets that reach shell or file inclusion sinks.

The CWE-502 condition in the theme creates a direct injection sink. Exploitation requires only an authenticated session with low privileges, which lowers the bar significantly compared to administrator-only flaws.

Root Cause

The root cause is unsafe deserialization of user-supplied data within the visual-arts theme code path. Input that should be treated as opaque data is instead passed to unserialize(), allowing the deserializer to construct PHP objects defined by the attacker. Safer alternatives such as json_decode() or unserialize($data, ['allowed_classes' => false]) were not used.

Attack Vector

The attack vector is network-based. An authenticated user submits a crafted request containing a serialized PHP payload to an endpoint exposed by the theme. The server deserializes the payload, instantiates attacker-chosen objects, and triggers gadget chains during object lifecycle events. Successful exploitation does not require user interaction.

The vulnerability manifests when the theme calls PHP's unserialize() on request parameters. See the Patchstack WordPress Vulnerability advisory for technical details.

Detection Methods for CVE-2025-31422

Indicators of Compromise

HTTP POST or GET requests to WordPress endpoints containing serialized PHP markers such as O:, a:, or s: followed by class names and lengths
Unexpected PHP files appearing in wp-content/uploads/ or theme directories
New or modified WordPress administrator accounts that were not provisioned through normal workflows
Outbound network connections from the web server process to unfamiliar hosts following theme-related requests

Detection Strategies

Inspect web server and WordPress request logs for serialized object signatures in parameters processed by the visual-arts theme
Monitor PHP error logs for __wakeup, __destruct, or class-not-found errors that indicate failed deserialization attempts
Apply file integrity monitoring across the WordPress installation to surface unauthorized changes to PHP files
Use WordPress security scanners that flag known PHP Object Injection gadget chains

Monitoring Recommendations

Alert on process executions spawned by the web server user, such as php, sh, or bash, that follow requests to theme endpoints
Track creation of new administrator users and changes to wp_options records like active_plugins and siteurl
Forward web server and PHP-FPM logs to a centralized SIEM and correlate with WordPress audit events
Baseline normal request patterns to the visual-arts theme and alert on payloads containing serialized object syntax

How to Mitigate CVE-2025-31422

Immediate Actions Required

Identify all WordPress sites running the Visual Art | Gallery theme version 2.4 or earlier
Update the visual-arts theme to a patched release as soon as the vendor publishes one, or deactivate and remove the theme until a fix is available
Audit user accounts for unauthorized additions or role changes and rotate credentials for all WordPress users
Review uploaded files and theme directories for webshells or modified PHP files

Patch Information

At the time of publication, the Patchstack advisory lists affected versions through 2.4. Administrators should consult the vendor's theme page on WordPress.org or the designthemes support channels for a fixed release. Apply the patched version through the WordPress dashboard or via WP-CLI once available.

Workarounds

Deactivate the Visual Art | Gallery theme and switch to a default WordPress theme until a patched version is installed
Restrict access to authenticated WordPress endpoints using a web application firewall (WAF) ruleset that blocks serialized PHP payloads in request parameters
Limit account creation and tighten role assignments so that low-privileged user accounts cannot reach the vulnerable code path
Disable PHP execution in writable directories such as wp-content/uploads/ via web server configuration

bash

# Example: block PHP execution in WordPress uploads directory (Apache)
# Place in wp-content/uploads/.htaccess
<FilesMatch "\.(php|phtml|phar)$">
    Require all denied
</FilesMatch>

# WP-CLI: deactivate the vulnerable theme by switching to a default theme
wp theme activate twentytwentyfour
wp theme delete visual-arts