CVE-2025-30949: Site Chat on Telegram Object Injection

CVE-2025-30949 Overview

CVE-2025-30949 is a critical deserialization of untrusted data vulnerability affecting the Site Chat on Telegram WordPress plugin developed by Guru Team. This vulnerability enables attackers to perform PHP Object Injection attacks, potentially leading to complete site compromise. The flaw exists in versions up to and including 1.0.4 of the plugin.

Critical Impact

Unauthenticated attackers can exploit this PHP Object Injection vulnerability to execute arbitrary code, manipulate data, or achieve full WordPress site takeover through the deserialization of untrusted input.

Affected Products

• Site Chat on Telegram WordPress Plugin versions through 1.0.4
• WordPress installations using the vulnerable plugin
• Websites with Telegram chat integration via Guru Team plugin

Discovery Timeline

• 2025-07-16 - CVE-2025-30949 published to NVD
• 2025-07-16 - Last updated in NVD database

Technical Details for CVE-2025-30949

Vulnerability Analysis

This vulnerability stems from insecure deserialization practices within the Site Chat on Telegram plugin. When the application processes serialized data from untrusted sources without proper validation, attackers can inject malicious objects that execute arbitrary code upon deserialization.

PHP Object Injection occurs when user-controllable data is passed to the unserialize() function without adequate sanitization. In WordPress environments, this is particularly dangerous because the platform and its plugins often contain "magic methods" (such as __wakeup(), __destruct(), or __toString()) that can be abused to create Property-Oriented Programming (POP) chains leading to remote code execution.

The network-accessible nature of this vulnerability means attackers can exploit it remotely without any prior authentication or user interaction, significantly increasing the risk profile for affected WordPress installations.

Root Cause

The root cause is classified under CWE-502 (Deserialization of Untrusted Data). The Site Chat on Telegram plugin fails to properly validate or sanitize serialized data before processing it through PHP's deserialization mechanisms. This allows attackers to craft malicious serialized objects that, when deserialized by the vulnerable application, trigger unintended code execution paths through existing class methods within WordPress core or installed plugins.

Attack Vector

The attack vector is network-based and requires no privileges or user interaction. An attacker can exploit this vulnerability by:

1. Identifying an endpoint that processes serialized data in the Site Chat on Telegram plugin
2. Crafting a malicious serialized PHP object containing a POP chain
3. Submitting the payload to the vulnerable endpoint
4. The server deserializes the malicious object, triggering the embedded POP chain
5. Arbitrary code execution occurs in the context of the web server

The vulnerability mechanism involves the unsafe handling of serialized PHP objects. When user-controlled data reaches the unserialize() function, attackers can inject crafted objects that exploit magic methods in available classes. For detailed technical analysis, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-30949

Indicators of Compromise

• Unusual PHP error logs containing serialization or object instantiation errors
• Unexpected file creation or modification in WordPress directories
• Web server logs showing suspicious POST requests with serialized PHP data (base64-encoded or raw O: prefixed strings)
• New administrator accounts or modified user privileges without authorization

Detection Strategies

• Monitor web application firewall (WAF) logs for serialized PHP object patterns in request bodies
• Implement SIEM rules to detect unserialize() function calls with external input
• Review WordPress plugin activity logs for unauthorized configuration changes
• Deploy endpoint detection solutions to identify suspicious PHP process behavior

Monitoring Recommendations

• Enable verbose logging for the Site Chat on Telegram plugin
• Configure real-time alerting for file system changes in WordPress directories
• Implement network traffic analysis to identify anomalous POST request patterns
• Regularly audit WordPress user accounts and permission changes

How to Mitigate CVE-2025-30949

Immediate Actions Required

• Deactivate and remove the Site Chat on Telegram plugin if running version 1.0.4 or earlier
• Audit WordPress installations for signs of compromise
• Review server logs for exploitation attempts
• Consider implementing a Web Application Firewall with PHP object injection rules

Patch Information

No vendor patch information is currently available in the CVE data. Website administrators should check the Patchstack WordPress Vulnerability Report for updates on available fixes and monitor the WordPress plugin repository for updated versions of Site Chat on Telegram.

Workarounds

• Disable the Site Chat on Telegram plugin until a patched version is available
• Implement WAF rules to block requests containing serialized PHP objects
• Use alternative Telegram integration solutions that do not have known vulnerabilities
• Apply PHP configuration hardening by disabling dangerous functions where possible

# Configuration example - WordPress .htaccess protection
# Block requests containing serialized PHP object patterns
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{QUERY_STRING} (^|&)(O:|a:|s:)[0-9]+ [NC,OR]
RewriteCond %{REQUEST_BODY} (O:|a:|s:)[0-9]+ [NC]
RewriteRule .* - [F,L]
</IfModule>