CVE-2025-58833: Invelity MyGLS Connect CSRF Vulnerability

CVE-2025-58833 Overview

CVE-2025-58833 is a Cross-Site Request Forgery (CSRF) vulnerability in the INVELITY Invelity MyGLS connect WordPress plugin (invelity-mygls-connect). The flaw allows PHP Object Injection when an authenticated user is tricked into visiting an attacker-controlled page. The vulnerability affects all versions up to and including 1.1.1. Successful exploitation can lead to compromise of confidentiality, integrity, and availability of the affected WordPress installation. The weakness is tracked under CWE-352: Cross-Site Request Forgery.

Critical Impact

Attackers can chain CSRF with unsafe deserialization to trigger Object Injection, potentially leading to remote code execution on the WordPress host.

Affected Products

• INVELITY Invelity MyGLS connect plugin for WordPress (invelity-mygls-connect)
• All plugin versions from initial release through 1.1.1
• WordPress sites with the plugin active and administrative users browsing untrusted content

Discovery Timeline

• 2025-09-05 - CVE-2025-58833 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-58833

Vulnerability Analysis

The vulnerability combines two weaknesses. First, plugin endpoints accept state-changing requests without validating an anti-CSRF token (WordPress nonce). Second, those endpoints deserialize attacker-controlled input, enabling PHP Object Injection. An attacker hosts a malicious page that issues a forged request to the target site. When an authenticated WordPress user visits the page, the browser submits the request with valid session cookies. The plugin processes the request and instantiates attacker-supplied serialized objects. Depending on classes available in the WordPress runtime, the resulting POP (Property-Oriented Programming) chain can read files, write files, or execute arbitrary PHP code.

Root Cause

The root cause is the absence of CSRF protection on sensitive plugin actions combined with the use of unserialize() on untrusted input. WordPress provides wp_nonce_field(), check_admin_referer(), and wp_verify_nonce() to prevent forged requests, but the affected handlers do not enforce them. Passing user-controlled data into PHP deserialization is classified under CWE-502 and is the underlying primitive that elevates this CSRF to Object Injection.

Attack Vector

Exploitation requires user interaction over the network. An attacker crafts an HTML page containing an auto-submitting form or fetch request targeting the vulnerable plugin endpoint. The payload includes a serialized PHP object designed to trigger magic methods such as __wakeup() or __destruct() on instantiation. When a logged-in WordPress administrator visits the malicious page, their authenticated session is used to deliver the payload. The plugin deserializes the input and the gadget chain executes within the WordPress process context. Refer to the Patchstack Vulnerability Report for additional technical detail.

Detection Methods for CVE-2025-58833

Indicators of Compromise

• HTTP POST or GET requests to invelity-mygls-connect plugin endpoints originating from external Referer headers
• Request bodies containing serialized PHP markers such as O:, a:, or s: followed by class names
• Unexpected creation or modification of PHP files under wp-content/uploads/ or plugin directories
• New administrator accounts or modified user roles in wp_users and wp_usermeta

Detection Strategies

• Inspect web server access logs for requests to plugin endpoints missing the _wpnonce parameter
• Deploy a Web Application Firewall (WAF) rule that flags serialized PHP object patterns in request parameters
• Monitor PHP error logs for __wakeup, __destruct, or class instantiation warnings linked to plugin paths
• Hash and baseline plugin files, alerting on unauthorized changes

Monitoring Recommendations

• Forward WordPress and web server logs to a centralized SIEM for correlation across sessions
• Alert on administrative actions performed within seconds of a cross-origin Referer value
• Track outbound connections from the web server process to unknown hosts, indicating possible post-exploitation

How to Mitigate CVE-2025-58833

Immediate Actions Required

• Deactivate the invelity-mygls-connect plugin until a patched release is verified and applied
• Restrict WordPress administrator browsing to trusted sites and require multi-factor authentication
• Apply a WAF virtual patch that blocks serialized PHP payloads to plugin endpoints
• Audit user accounts, scheduled tasks (wp_cron), and uploaded files for signs of post-exploitation

Patch Information

At the time of publication, the Patchstack advisory lists all versions up to and including 1.1.1 as vulnerable with no fixed version indicated. Administrators should monitor the plugin page on WordPress.org and the vendor advisory for an updated release, then upgrade immediately when available.

Workarounds

• Remove or disable the plugin if the MyGLS shipping integration is not business-critical
• Restrict access to wp-admin by IP allowlist at the web server or firewall layer
• Configure the WAF to drop requests containing PHP serialization tokens such as O: and a: in form parameters targeting the plugin

# Configuration example: ModSecurity rule blocking serialized PHP objects to the plugin
SecRule REQUEST_URI "@contains /wp-content/plugins/invelity-mygls-connect/" \
    "id:1058833,phase:2,deny,status:403,log,\
     chain,msg:'CVE-2025-58833 - PHP Object Injection attempt'"
    SecRule ARGS|REQUEST_BODY "@rx O:\d+:\"[A-Za-z_][A-Za-z0-9_]*\":\d+:\{" \
        "t:none,t:urlDecode"