Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-30402 is a critical remote code execution vulnerability in wgcloud versions up to and including v2.3.7. It exists in the "test connection" feature of the backend database management module, accessible via the `/dbInfo/validate` endpoint.'}, {'type': 'paragraph', 'content': 'The vulnerability arises from unsafe deserialization in the MySQL JDBC driver (version 5.1.46) used by wgcloud. Attackers can manipulate parameters in the JDBC URL, especially the `dbname` parameter, to inject malicious payloads that trigger deserialization of untrusted data.'}, {'type': 'paragraph', 'content': 'By exploiting this flaw, an attacker can execute arbitrary Java code remotely, demonstrated by launching applications such as the Windows calculator through crafted payloads.'}] [2]

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Impact Analysis

This vulnerability allows a remote attacker to execute arbitrary code on the affected system without authorization.

Successful exploitation can lead to full system compromise, including unauthorized access, data theft, system manipulation, or disruption of services.

Because the vulnerability is in a database connection testing feature, attackers can leverage it to gain control over the backend infrastructure, potentially affecting the confidentiality, integrity, and availability of data and services.

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Compliance Impact

I don't know

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Detection Guidance

This vulnerability can be detected by monitoring and analyzing requests to the `/dbInfo/validate` endpoint, which is used by the test connection feature in wgcloud. Specifically, look for POST requests that include suspicious or manipulated JDBC URL parameters such as `dbname` containing payloads with parameters like `autoDeserialize=true` and `statementInterceptors=com.mysql.jdbc.interceptors.ServerStatusDiffInterceptor`.

One detection approach is to set up a fake MySQL server listening on port 3308 to capture and analyze malicious payloads sent through the vulnerable endpoint.

Example commands to detect exploitation attempts might include using network monitoring tools like tcpdump or Wireshark to capture traffic on port 3308 or to the application server, and searching logs for suspicious POST requests to `/dbInfo/validate` with unusual JDBC URL parameters.

• Use tcpdump to capture traffic on port 3308: `tcpdump -i any port 3308 -w capture.pcap`
• Search application logs for POST requests to `/dbInfo/validate` containing suspicious `dbname` parameters.
• Set up a fake MySQL server on port 3308 to capture and analyze incoming JDBC connection attempts.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable `/dbInfo/validate` endpoint to trusted users only, and blocking or filtering suspicious JDBC URL parameters that attempt to enable deserialization features.

Additionally, consider disabling or restricting the test connection feature in wgcloud if possible, until a patch or update is available.

Monitoring and blocking network traffic on port 3308, or any unusual outbound connections initiated by the application, can help prevent exploitation.

Ultimately, updating wgcloud to a version later than 2.3.7 that addresses this vulnerability or applying vendor-provided patches is recommended once available.

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