CVE-2025-58244: Constructo CSRF Vulnerability

CVE-2025-58244 Overview

CVE-2025-58244 is a Cross-Site Request Forgery (CSRF) vulnerability in the Anps Constructo WordPress theme that leads to PHP Object Injection. The flaw affects all versions of Constructo up to and including 4.3.9. An attacker can craft a malicious request that, when triggered by an authenticated user visiting an attacker-controlled page, forces the victim's browser to submit a forged request to the vulnerable theme. The forged request can carry a serialized payload that the theme deserializes, enabling Object Injection [CWE-352]. Successful exploitation can compromise confidentiality, integrity, and availability of the WordPress site.

Critical Impact
Attackers can chain CSRF with PHP Object Injection to achieve unauthorized state changes and potential code execution on affected WordPress sites running Constructo theme versions through 4.3.9.

Affected Products

Anps Constructo WordPress theme versions through 4.3.9
WordPress sites using vulnerable Constructo theme builds
Any deployment that has not applied a vendor-supplied fix beyond version 4.3.9

Discovery Timeline

2025-09-22 - CVE-2025-58244 published to NVD
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-58244

Vulnerability Analysis

The vulnerability combines two distinct weaknesses in the Constructo theme. First, a state-changing endpoint lacks anti-CSRF protections such as WordPress nonce validation. Second, the same code path accepts user-controlled serialized input that is passed to unserialize() or an equivalent deserialization routine. The combination allows an unauthenticated attacker to deliver a serialized PHP object to the target site by tricking an authenticated administrator into loading attacker-controlled content. User interaction is required for exploitation, but the impact spans confidentiality, integrity, and availability.

Root Cause

The root cause is the absence of CSRF token validation on a request handler that performs deserialization of attacker-controllable data. WordPress provides the wp_verify_nonce() and check_admin_referer() functions to validate request origin, but the affected Constructo handler does not enforce these checks. When deserialization runs on attacker-supplied data, PHP magic methods such as __wakeup() and __destruct() on existing gadget classes can be invoked, producing Object Injection conditions.

Attack Vector

Exploitation requires an authenticated WordPress user, typically an administrator, to visit a page controlled by the attacker. That page issues a cross-origin request to the vulnerable Constructo endpoint, passing a crafted serialized payload. Because the browser automatically attaches the victim's session cookies, the server processes the request as if the victim initiated it. The serialized payload is then deserialized server-side, triggering the Object Injection. No verified public proof-of-concept exploit is available at this time. See the Patchstack CSRF Vulnerability Report for additional technical context.

Detection Methods for CVE-2025-58244

Indicators of Compromise

Unexpected POST requests to Constructo theme endpoints originating from external Referer headers
Serialized PHP payloads (strings beginning with O:, a:, or s:) appearing in request bodies or query parameters
Creation of new administrator accounts or modification of WordPress options without corresponding admin-panel sessions
Unexpected file writes under wp-content/themes/constructo/ or wp-content/uploads/

Detection Strategies

Monitor web server access logs for requests to Constructo theme handlers that lack a same-origin Referer or valid _wpnonce parameter
Inspect HTTP request bodies for PHP serialization markers to identify Object Injection attempts
Correlate authenticated administrator sessions with cross-origin POST requests submitted within the session window

Monitoring Recommendations

Enable a web application firewall ruleset that blocks PHP serialized objects in request parameters destined for WordPress themes
Audit installed theme versions across the estate and alert on any Constructo build at or below 4.3.9
Track WordPress audit log events for option updates, user role changes, and theme file modifications

How to Mitigate CVE-2025-58244

Immediate Actions Required

Identify all WordPress sites running the Anps Constructo theme and confirm installed versions
Update Constructo to a release later than 4.3.9 if available from the vendor
Restrict administrator browsing to trusted sites and enforce session timeouts to reduce CSRF exposure
Deploy WAF rules that strip or block PHP serialized payloads in inbound theme requests

Patch Information

No fixed version is documented in the available references at the time of publication. Refer to the Patchstack advisory for updates on vendor remediation. If no patched build is available, treat the theme as vulnerable and apply compensating controls.

Workarounds

Disable or replace the Constructo theme until a vendor patch is released
Place the WordPress admin interface behind IP allowlisting or a VPN to limit CSRF exposure
Configure SameSite=Strict on WordPress session cookies where compatible to prevent cross-site cookie attachment
Use a virtual-patching WAF rule to reject requests containing serialized PHP objects targeting theme endpoints

bash

# Example ModSecurity rule to block PHP serialized payloads to Constructo endpoints
SecRule REQUEST_URI "@contains /wp-content/themes/constructo/" \
    "id:1058244,phase:2,deny,status:403,log,\
     msg:'CVE-2025-58244 Constructo CSRF/Object Injection attempt',\
     chain"
  SecRule ARGS|REQUEST_BODY "@rx (?:^|&|=)[Oa]:\d+:\"" \
    "t:none"