OpenCms vulnerable to unauthenticated XXE (XML External Entity) vulnerability

published: Dec. 9, 2023

Take action: If you are using OpenCms, update to version 10.5.1 or later ASAP. There is no hiding behind a firewall, and no reason for optimism. Hackers will detect OpenCms automatically and attack you.


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OpenCms, an open-source Java framework by Alkacon Software, faces a critical unauthenticated XXE (XML External Entity) vulnerability, tracked as CVE-2023-42344 (CVSS score 9.8). This vulnerabilit is affecting versions 9.0.0 to 10.5.0 andallows attackers to manipulate file upload parameters for remote code execution.

An XXE (XML External Entity) vulnerability is a type of security flaw found in web applications that parse XML input. This vulnerability occurs when an application processes XML input that includes references to external entities. Attackers can exploit XXE vulnerabilities to perform various malicious activities, such as accessing confidential data, causing denial of service, or executing server-side request forgery.

For example, by including malicious content in an XML document, attackers can trick the application into accessing unauthorized files on the server, executing remote requests, or even running arbitrary code, depending on the severity of the vulnerability and the configuration of the XML parser. XXE vulnerabilities are particularly concerning because they can lead to significant data breaches and system compromises.

To mitigate this risk, it's advised to upgrade OpenCms to version 10.5.1 or later.

OpenCms vulnerable to unauthenticated XXE (XML External Entity) vulnerability