CVE-2025-31924: Crafts & Arts Object Injection Vulnerability

CVE-2025-31924 Overview

CVE-2025-31924 is a PHP Object Injection vulnerability in the designthemes Crafts & Arts WordPress theme (crafts-and-arts). The flaw stems from deserialization of untrusted data [CWE-502] and affects all versions of the theme up to and including 2.5. An authenticated attacker with low privileges can submit crafted serialized payloads that the theme passes to unserialize(), instantiating arbitrary PHP objects within the application context. When combined with a suitable POP (Property-Oriented Programming) gadget chain from WordPress core or another installed plugin, exploitation can lead to remote code execution, file manipulation, or data theft.

Critical Impact
Authenticated attackers can trigger PHP object injection to achieve arbitrary code execution, full site compromise, and data exfiltration on WordPress sites running Crafts & Arts ≤ 2.5.

Affected Products

designthemes Crafts & Arts WordPress theme — versions up to and including 2.5
WordPress sites with the crafts-and-arts theme active or installed
Hosting environments running PHP with the vulnerable theme deployed

Discovery Timeline

2025-05-23 - CVE-2025-31924 published to the National Vulnerability Database
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-31924

Vulnerability Analysis

The vulnerability resides in code paths within the Crafts & Arts theme that pass attacker-influenced input to PHP's unserialize() function. PHP deserialization automatically reconstructs objects from serialized strings and invokes magic methods such as __wakeup(), __destruct(), and __toString() during the process. When untrusted data reaches these code paths, attackers control the class names and property values of the instantiated objects.

Object injection by itself does not guarantee code execution. Attackers chain the injected object with existing classes loaded in the WordPress runtime, called POP gadgets, to escalate impact. WordPress core, popular plugins, and Composer dependencies provide well-documented gadget chains that lead to file writes, SQL injection, or system() calls. The AV:N/AC:L/PR:L/UI:N profile in the CVSS vector indicates the attacker needs only network access and a low-privileged account.

Root Cause

The root cause is the use of unserialize() on data sourced from HTTP requests, cookies, or the WordPress options table without prior cryptographic integrity verification. Secure handling requires json_decode() for structured data or wrapping serialized payloads with HMAC validation before deserialization.

Attack Vector

An authenticated user submits a crafted serialized PHP object through a theme parameter that reaches the vulnerable unserialize() sink. The injected object triggers a gadget chain on instantiation or destruction, executing attacker-chosen operations under the WordPress process privileges. Refer to the Patchstack advisory for CVE-2025-31924 for advisory-specific technical details.

Detection Methods for CVE-2025-31924

Indicators of Compromise

HTTP request bodies or query parameters containing serialized PHP markers such as O:, a:, or s: directed at theme endpoints under /wp-content/themes/crafts-and-arts/.
Unexpected PHP files written to wp-content/uploads/ or theme directories following authenticated requests.
New or modified WordPress administrator accounts created without a corresponding admin session in logs.
PHP error log entries referencing __wakeup, __destruct, or class instantiation failures from theme code paths.

Detection Strategies

Inspect web server access logs for POST requests to Crafts & Arts theme handlers carrying serialized object payloads.
Deploy a web application firewall (WAF) rule that blocks request bodies matching PHP serialization patterns targeting theme endpoints.
Run file integrity monitoring across wp-content/themes/ and wp-content/uploads/ to identify unauthorized writes.

Monitoring Recommendations

Forward WordPress access logs, PHP error logs, and authentication events to a centralized analytics platform for correlation.
Alert on outbound network connections initiated by the PHP-FPM or web server process to unexpected destinations.
Track creation of WordPress users, role changes, and option table modifications in real time.

How to Mitigate CVE-2025-31924

Immediate Actions Required

Deactivate the Crafts & Arts theme on any site running version 2.5 or earlier until a patched release is confirmed installed.
Restrict access to /wp-admin/ to known administrator IP ranges to reduce the authenticated attack surface.
Rotate WordPress administrator credentials and audit existing user accounts for unauthorized additions.
Review wp-content/uploads/ and theme directories for unexpected PHP files and remove any web shells found.

Patch Information

No fixed version is identified in the available advisory data. Site administrators should consult the Patchstack advisory for CVE-2025-31924 and the designthemes vendor channel for an updated theme release, then upgrade to the patched version once available.

Workarounds

Temporarily replace Crafts & Arts with a different theme until a fixed version is released.
Deploy WAF signatures that block PHP serialization payloads (O:\d+:, a:\d+:{) in request parameters targeting the theme.
Disable or remove unused WordPress plugins that expose POP gadget chains to reduce exploit feasibility.

bash

# Example ModSecurity rule to block PHP serialized objects in request bodies
SecRule REQUEST_BODY "@rx (?i)(O|a):[0-9]+:\{" \
    "id:1003192,phase:2,deny,status:403,\
    msg:'PHP Object Injection attempt blocked (CVE-2025-31924)',\
    tag:'CWE-502'"