Inside the Struts Trap: How a Silent Java Flaw Could Crack Open Corporate Vaults

It started, as so many breaches do, not with a bang but with a whisper: a hidden flaw in a ubiquitous web framework, lying dormant for years, waiting for the right payload. Now, with CVE-2025-68493, Apache Struts 2 finds itself at the heart of a new security storm-one that could quietly open the door to sensitive files, confidential business data, and even internal networks, all with a single malicious XML file.

Fast Facts

• Vulnerability CVE-2025-68493 affects Apache Struts 2’s XWork component.
• Enables XML External Entity (XXE) attacks, risking data theft, DoS, and SSRF.
• Impacts both legacy and current Struts 2 versions-many still unpatched in the wild.
• Patches available in Struts 6.1.1 and later; fixes are backward compatible.
• Temporary mitigations possible, but immediate patching is highly recommended.

The heart of the problem lies within XWork, a core component of Apache Struts 2, used by thousands of Java-based web applications. The flaw, discovered by security researchers at ZAST.AI, is deceptively simple: improper validation of XML configuration files. When Struts 2 parses an XML file, it fails to block dangerous “external entities”-special XML features that attackers can exploit to make the application fetch files from the server’s own disk or from other internal resources.

This opens the door to XML External Entity (XXE) injection attacks, a technique infamous for its ability to exfiltrate sensitive server files, leak credentials, or even pivot further into a company’s internal infrastructure. For organizations running outdated or unpatched Struts 2-especially those using legacy versions that Apache no longer supports-the risk is especially acute. Attackers could potentially steal proprietary documents, customer data, or cause service outages, all without tripping conventional alarms.

The vulnerability’s reach is broad. Struts 2 powers everything from government portals to corporate intranets. And while the Apache team has moved quickly to release a fix-version 6.1.1 and above-the reality is that many organizations lag behind in patching, often due to concerns over breaking legacy integrations. Fortunately, the Struts team has ensured this fix is backward compatible, reducing upgrade friction.

For those unable to patch immediately, all is not lost. Security administrators can deploy temporary defenses: configuring custom XML parsers (like a hardened SAXParserFactory) to block external entities, or setting Java system properties to block risky XML features. These mitigations buy time-but the clock is ticking.

This latest Struts scare is a stark reminder of the framework’s checkered past, including its infamous role in the Equifax breach. In today’s threat landscape, even minor missteps in legacy code can have catastrophic consequences. The lesson? Don’t wait for a headline-grabbing incident-patch now, or risk becoming the next cautionary tale.

WIKICROOK

• Apache Struts 2: Apache Struts 2 is an open-source Java web framework that helps developers build scalable, enterprise-grade web applications using the MVC architecture.
• XWork: XWork is the core Struts 2 component responsible for processing configuration and actions, enabling secure and efficient request handling in Java web applications.
• XML External Entity (XXE): An XML External Entity (XXE) attack occurs when hackers exploit XML data to access external files or systems, risking data leaks or breaches.
• Server: A server is a computer or software that provides data, resources, or services to other computers, called clients, over a network.
• SAXParserFactory: SAXParserFactory is a Java class for creating SAX XML parsers. Its configuration affects XML processing and can introduce security risks if not handled properly.