Overview
CVE-2025-66073 describes a Deserialization of Untrusted Data vulnerability affecting the WP Webhooks plugin for WordPress. Specifically, versions up to and including 3.3.8 are susceptible to Object Injection, potentially allowing attackers to execute arbitrary code on the affected server. This vulnerability has been reported and analyzed by Patchstack.
Technical Details
The vulnerability stems from the plugin’s handling of deserialized data. If the plugin deserializes untrusted data without proper sanitization or validation, an attacker can inject malicious PHP objects. Upon deserialization, these objects can trigger arbitrary code execution, potentially leading to complete server compromise. The specific endpoint or code path responsible for this deserialization isn’t detailed here but is available in the reference link provided by Patchstack.
CVSS Analysis
According to the provided information, a CVSS score and Severity level are currently listed as N/A. This is likely due to the vulnerability being newly discovered, and further analysis is ongoing to determine its precise impact and exploitability. A proper CVSS score will depend on factors such as the attack vector, attack complexity, required privileges, user interaction, confidentiality impact, integrity impact, and availability impact. This information will be updated as soon as it is available.
Possible Impact
The potential impact of this Object Injection vulnerability is severe. Successful exploitation could allow an attacker to:
- Gain complete control of the WordPress website.
- Execute arbitrary code on the server hosting the website.
- Steal sensitive data, including user credentials and database information.
- Deface the website or use it to distribute malware.
- Compromise other websites hosted on the same server.
Given the potential for complete system compromise, immediate action is required to mitigate this risk.
Mitigation or Patch Steps
The most critical step is to immediately update the WP Webhooks plugin to the latest available version. The vendor, Cozmoslabs, is likely aware of this vulnerability and may have released a patched version. Check the WordPress plugin repository or the WP Webhooks website for updates.
If an update is not yet available, consider the following temporary mitigation measures:
- Disable the WP Webhooks plugin until a patched version is released. This will prevent any potential exploitation of the vulnerability.
- Implement strict input validation and sanitization on any data processed by the plugin, especially if it involves deserialization. (Note: This requires advanced technical skills and may not be sufficient to completely mitigate the risk.)
- Monitor your server logs for any suspicious activity related to the WP Webhooks plugin.
References
Patchstack Vulnerability Database: WP Webhooks Object Injection Vulnerability (CVE-2025-66073)
